Lockly Deadbolt Replaced with Yale YDM 3109A on an Aluminium Door

For this job, we replaced an existing Lockly tubular deadbolt and lever latch on an aluminium door with a Yale YDM 3109A digital mortise lock.

The original Lockly lock and lever had already been installed with a 70mm backset, so we used the 70mm backset version of the Yale 3109A to help cover the existing bore holes and achieve a cleaner finish.

This wasn’t a simple lock swap. The Yale 3109A is a mortise lock, so we needed to create a new mortise cutout in the aluminium door, along with additional bore holes to suit the new lock body. The frame also required extra work for the new strike plate.

The mortise cutout was carefully measured and cleanly cut, allowing the lock body to sit neatly inside the door. This is especially important on aluminium doors, where the finish needs to be tidy and there is less room for error.

The end result is a cleaner and more integrated setup compared with the old separate deadbolt and lever latch. The Yale YDM 3109A is a popular digital mortise lock in New Zealand, offering PIN code, key tag and override key access in one complete lockset.

If you are replacing an old digital deadbolt or upgrading an aluminium door from a tubular lock to a mortise digital lock, it’s important to check the existing backset and bore hole positions first.