All you need is a dremel, a few cutting blades & a file or two.
I recommend taking all but one pin stack out from the lock. (you need at least one to keep it from spinning) IF you don't want to cut your pins then Cut the 4 empty spots, then move the stack to a spot already cut so you can cut the last spot with out cutting your pins.
Put it back together then mark where you need to cut. I don't know the measurements I just eye'ed it. I Imagine you could just measure to the center of each hole on the plug then mark those measurements on housing.
I got caught up in the moment of cutting so I failed to take pictures as I cut each slot but don't worry! just imagine a dremel slicing away at brass... It all looks the same
Just keep a steady hand and move slow, it will cut away pretty fast. After putting it back together the first time I noticed my cuts where not wide enough and was able to see just how much more I could shave off. I filed away some from the top and also filed a few random area's to clean them.End resaults:
its tolerance is a little bigger but it seemed to pick about the same.
.)