This model adapts the 8mm shaft of my lock to the Lock Pro. 

With the precise adapter the operation form the lock is much smoother. It's also faster, which I attribute to the lack of slack. 

The adapter was a friction fit on the lock shaft. I designed provision for two 4mm heat inserts if you want to additionally secure it to the metal shaft.

The adapter is a slip fit in the lock for ease of assembly. I've also uploaded Fusion file of the adapter. Feel free to remix to fi your lock, it's worth it.