Millenco Mantis 1 Replacement Lift Block Repair Insert Suits 117mm PZ

Millenco Mantis 1 Lift Block / Back Plate Insert – Direct-Fit Repair Part

Restore your Mantis 1 multipoint lock with this precision repair insert – stop euro cylinder failures before they cost you a full mechanism replacement.

Millenco Mantis 1 Lift Block / Back Plate Insert is the essential internal repair component that restores functionality to your Millenco Mantis 1 multipoint gearbox when the original backplate fractures. This direct-fit metal insert sits precisely behind the euro cylinder housing and prevents the catastrophic snap that occurs when non-original or over-length (longer than 40mm) cylinder fixing screws are used during maintenance or cylinder replacement. Designed exclusively for Mantis 1 mechanisms operating at 117mm PZ, this OEM-style part is the professional solution to a common installation error—delivering reliable security performance without the expense of replacing your entire multipoint lock assembly.

Whether you're a locksmith responding to a failed installation, a door fitter managing warranty repairs, or a homeowner who encountered this issue, this backplate insert represents the most cost-effective way to restore your Mantis 1 gearbox to full working condition. The component integrates seamlessly into your existing mechanism and functions identically to the original part, ensuring your uPVC or composite door security is restored to manufacturer specification.

Key Benefits:

• Precision-Engineered Repair Solution – Replaces the internal backplate that snaps when non-original or over-length euro cylinder fixing screws are incorrectly installed, restoring full locking functionality without full mechanism replacement.
• Significant Cost Savings – This targeted repair insert costs a fraction of replacing the entire Mantis 1 multipoint gearbox, making it an economical solution for both fitters and property owners managing unexpected failures.
• Exact Mantis 1 Compatibility – Engineered specifically for 117mm PZ multipoint gearboxes; the unique dual spindle centres (86/117mm) mean this insert is incompatible with Mantis 2 (95/65mm PZ) or Mantis 3 (92/62mm PZ) variants, ensuring you receive the correct component first time.
• Professional-Grade Performance – OEM-style specification maintains manufacturer security standards, delivering reliable operation identical to original equipment and protecting your investment in quality door security.
• Prevents Repeat Failures – Installing this insert gives you the opportunity to address the root cause—using the correct 40mm flat-ended fixing screw—ensuring the failure cannot recur and protecting against future euro cylinder maintenance issues.
• Minimal Downtime Installation – Unlike full mechanism replacement, this internal repair can be completed quickly by removing the gearbox cover plate and swapping the broken backplate, minimising disruption to your door security during the repair process.

Product Specifications:

• Brand: Millenco
• Product Type: Lift block / euro-hole backplate insert
• Compatibility: Millenco Mantis 1 multipoint gearbox (117mm PZ only)
• Mechanism Type: Multipoint lock system for uPVC and composite doors
• Material: Metal (OEM specification)
• Internal Component: Yes – repair insert for gearbox assembly
• Fixing Screw Specification: Use 40mm flat-ended cylinder screw after repair
• Reason for Failure: Original backplate breaks when non-original or cylinder fixing screws longer than 40mm are used

Dimensions:

• Mechanism PZ: 117mm (dual spindle centres: 86mm / 117mm)
• Gearbox Type: Mantis 1 only
• Maximum Cylinder Screw Length (Correct): 40mm flat-ended
• Not Suitable For: Mantis 2 (95/65mm PZ) or Mantis 3 (92/62mm PZ)

Pro Tips:

Pro Tip: Before removing any internal components from your Mantis 1 gearbox, take clear photographs of the entire internal layout and component positions. This simple step dramatically reduces reassembly errors and ensures all springs, cams, and levers return to their correct positions. When reassembling, source the original Millenco 40mm flat-ended fixing screw or an equivalent specification screw—this is critical to preventing the backplate from snapping again during future cylinder maintenance.

What's in the Pack:

• 1 × Millenco Mantis 1 backplate insert / lift block

Note: Cylinder fixing screws and cover plate fixings are not included; use your original components or source a 40mm flat-ended fixing screw separately.

Frequently Asked Questions:

Will this part fit my Millenco Mantis multipoint lock?

This insert is designed exclusively for Mantis 1 mechanisms with 117mm PZ (the dual spindle centres are 86mm and 117mm). It will not fit Mantis 2 (95/65mm PZ) or Mantis 3 (92/62mm PZ) gearboxes, as each variant uses different internal specifications. Check your mechanism's PZ marking before ordering. If you're unsure, measure the distance between the two euro cylinder spindle holes—if it measures 117mm, this is the correct part for you.

What caused my backplate to snap in the first place?

The Mantis 1 backplate fractures when a non-original or over-length cylinder fixing screw is used. The standard Millenco cylinder screw is 40mm with a flat end. If a longer screw (typically 45mm, 50mm, or longer) or a screw with a domed head is tightened, the excess length drives through the backplate and causes it to crack or shatter. This is one of the most common Mantis 1 failures, particularly after cylinder maintenance or replacement by non-specialist installers. Using the correct 40mm flat-ended screw eliminates this risk.

Can I install this myself, or do I need a professional locksmith?

While this is an internal component requiring gearbox cover removal, experienced DIYers can undertake the repair. However, internal mechanism work is at the fitter's discretion and risk. The process requires carefully removing the gearbox cover plate, photographing the internal layout, removing the broken backplate, inserting this repair component, and reassembling. If you're unfamiliar with multipoint lock mechanisms, engaging a qualified locksmith or door fitter is strongly recommended to ensure correct reassembly and full security function.

After installation, what fixing screw should I use?

Use a 40mm flat-ended fixing screw when reinstalling your euro cylinder after this repair. This is the original Millenco specification and is critical to preventing the backplate from snapping again. Avoid non-original screws, dome-headed variants, or any screw longer than 40mm, as these will cause repeat failure. If you've lost your original Millenco screw, purchase a replacement 40mm flat-ended euro cylinder fixing screw designed for multipoint lock systems.

Is this the same as a "lift block," "back cam lift block," or "euro-hole backplate"?

Yes—this component is known by several trade names including lift block, euro-hole backplate insert, back cam lift block, and backplate insert. They all refer to the same internal metal component that sits directly behind the euro cylinder within the Mantis 1 gearbox. Regardless of terminology, ensure you're ordering the part specifically for Mantis 1 (117mm PZ) to guarantee compatibility.

Why Choose Millenco Mantis 1 Lift Block Insert?

The Millenco Mantis 1 is a robust, dual-spindle multipoint locking mechanism trusted by thousands of UK homeowners and professional installers. When the internal backplate fails—typically due to an installation mishap with incorrect fixing screws—this repair insert offers the most practical, cost-effective restoration path. Rather than investing in a complete mechanism replacement, this direct-fit component restores your door's security integrity and delivers the peace of mind that your multipoint lock will function reliably for years to come. Combined with the simple but essential practice of using the correct 40mm flat-ended cylinder screw going forward, this insert transforms a potentially costly security failure into a straightforward, affordable repair.