Why Won't My Shootbolt Extend? Diagnosing Common Faults

Why won't my shootbolt extend? A shootbolt that fails to extend is a frequent call-out for both homeowners and tradespeople. Whether fitted to a French door, patio door or an espagnolette-equipped window, a sticking or non-extending shootbolt usually points to alignment, wear or mechanical failure. This post explains common causes, step-by-step diagnostics and practical repair options suitable for experienced DIYers and trade professionals.

How shootbolts work: a quick recap

A shootbolt is a steel pin that drops into a keeper or striker to secure a sash at the top or bottom; they are often used in pairs on doors and in conjunction with an espagnolette mechanism on windows. The shootbolt is driven by either a rod system or an internal gearbox and follower that converts handle rotation into linear movement. If that conversion is interrupted, the bolt will not extend.

Common reasons a shootbolt will not extend

• Mechanical obstruction in the keepers or strike plate: paint, debris, or misaligned furniture can block movement.
• Misalignment between sash and frame: settlement or swelling can move keepers out of line so the bolt cannot find its slot.
• Worn or broken followers, cams or drive pins inside the espagnolette gearbox: these are common wear items.
• Seized or corroded shootbolt: rust or hardened dirt prevents sliding.
• Loose or sheared fixing screws and rivets: the mechanism may not transfer motion if fixings have failed.
• Bent or broken shootbolt rod: physical damage prevents full travel.
• Handle and spindle issues: if the spindle is not engaging the gearbox, the bolt will not be driven.
• Multipoint lock out of sync: when the main lock is misaligned the auxiliary shootbolts can jam.

Quick diagnostic steps: what to check first

Start with simple checks you can do without removing the sash. These often reveal obvious faults and save time.

• Operate the handle slowly: listen for grinding, clicking or no resistance; note whether any movement of the shootbolt is visible at the edge.
• Inspect the keepers and strike plates: look for paint build-up, rust or loose screws; try to slide any debris free with a plastic spatula.
• Check alignment: with the door or window closed gently push the sash to see if the bolt enters the keeper; uneven gaps or rubbing are signs of misalignment.
• Try the lock with the key: if the euro cylinder is stiff or not turning fully the mechanism will not actuate properly.
• Apply light lubrication: a silicone spray into the guide and a few drops of light oil on the moving parts can free a slightly seized bolt; avoid heavy greases that attract dirt.

Detailed inspection and DIY fixes

If the quick checks do not solve the problem you will need to open up the sash or remove the lock faceplate. Only undertake this if you are comfortable with basic hardware work and understand how to reposition components.

• Remove the end cap or cover plate to expose the shootbolt: use the correct screwdriver to avoid stripping screws.
• Operate the handle while watching the mechanism: this reveals whether the gearbox is turning and whether the drive pin engages the shootbolt. If the gearbox turns but the shootbolt does not move the follower or drive pin is likely broken.
• If the shootbolt is seized, tap it gently with a plastic mallet while applying a penetrating lubricant; do not use excessive force as this can twist the rod and cause further damage.
• Tighten or replace loose fixings: replace short or rusted screws with equivalent stainless steel ones. Where rivets have sheared replace with suitable screws and washers and use Loctite 243 if a permanent bond is required; ensure you do not damage the face of the profile.
• Adjust keepers: many keepers are adjustable. Loosen the screws slightly, reposition the keeper so the bolt can enter smoothly, then tighten; test several times to ensure repeatable operation under different weather conditions.

When to replace parts or the whole mechanism

Some faults are best solved by replacement rather than repair; for trade professionals this is often faster and more reliable for the customer.

• Broken follower, cam or drive pin: replace the espagnolette gearbox or the specific internal component; partial repairs may be possible but assess corrosion and wear first.
• Bent or worn shootbolt: replace the shootbolt assembly; cheap repairs can fail quickly so use quality stainless or zinc-plated replacements.
• Composite or timber frames with distorted profiles: if frame movement prevents consistent engagement consider planing, rebating or adjusting the frame; sometimes replacing the lock to a slightly different specification is required.
• Worn keepers: replace with adjustable keepers to allow on-site fine tuning; for trade use keep interchangeable parts in vans for quick service calls.

Lubrication and maintenance tips

Regular maintenance prevents most shootbolt problems. Advise homeowners on simple checks and add these to service schedules for managed properties.

• Lubricate moving parts twice a year: use light machine oil on steel shootbolts and silicone spray in guides. Do not use heavy greases that collect dirt.
• Keep keepers and striking faces free from paint and debris: if painting a door or window mask the hardware or remove it temporarily.
• Operate the lock regularly: handle use keeps components moving and reduces the chance of seizure.
• Inspect fixings and frame alignment annually: catch settling problems before they jam locking points.

Safety and when to call a professional

If the shootbolt has snapped, the gearbox is badly corroded or if you are unsure how to reassemble the mechanism call a qualified locksmith or window specialist. Incorrect reassembly can compromise security and void warranties. For commercial or landlord properties use an accredited installer to ensure compliance with insurance and building regulations.

Recommended Products

Based on this article, you may find these products helpful:

• TL Thumb Turn Euro Cylinder
• Ultion Plus TS007 3* Kitemarked Euro Key & Turn Cylinder
• ERAB Espagnolette Window Lock Universal Lock Replacement
• Avocet Slimline Offset Window Espag
• Multipoint Gearbox GU Old Style

Conclusion: next steps

Diagnosing a shootbolt that will not extend is a process of elimination: check for obstructions, alignment, lubrication and mechanical failure in that order. Many faults are straightforward for a confident DIYer to fix, but broken internal components, severe corrosion or distorted frames require professional replacement. If you need parts or technical guides on espagnolette-window-locks refer to our detailed resource here: /guides/espagnolette-window-locks. For on-site assistance contact a specialist installer or your local locksmith.