V1 of this tool worked well but had 1 negative and that was when you removed the tube from the buffer the tool would more than likely slide off and fall to the floor

V2 fixes this issue by incorporating it into the body of the buffer itself and now acts like a spring loaded button instead

link below to video showing how to install it (it can also just be shoved into the hole and it will snap into place if you want to do it that way but this way theres less chance of breakage