Dunno if this is a dead horse but people are always interested in this and I thought I'd share. Most of us know there's a small space under the cap on our glock knives. Some don't. Here's a mod I did years ago. To do this you'll need: 1/2" tap 1/2" stainless hex cap bolt 1/4" rubber oring All of these items are available @ your local home improvement store Pry out plastic cap and thread the metal cylinder inside. Slip oring onto end of bolt and tighten. If u want more space then the 11/2" then you'll have to bore it out more with a drill. I actually drilled the inside of the bolt and added a magnesium striker rod that works great with the bottle opener on the hand guard.