I have a Glock 23 I like quite a bit, but it's a Gen 3, so there are finger grooves and the grooves don't fit my fingers. The Pachmayr grip sleeves always intrigued me, because they effectively fill in the valleys of the Gen 3 finger grooves.
However, my issue with them was that they tend to move around a bit.
Learned over the weekend that if you use Ronson lighter fluid (the stuff people used to fill their Zippos with) to liberally lubricate the inside of the sleeve, then put the sleeve on, it's rock solid in about 3 minutes. I don't understand the chemistry involved, but I hear that the lighter fluid evaporates.
So now, my G23 finally fits my hand pretty well, and I didn't have to take a Dremel to it. Liked it so much I did the same thing to my G20, and after firing full house 10mm ammo this weekend the grip sleeve is still on as if it was glued.
Best thing is, these sleeves are pretty cheap. I think I paid $10 each for them. They are certainly not pretty at all, and it's hard to go from Spegel custom grips in Cocobolo to rubber anchored to plastic, but that's ok. My Glocks aren't meant to be shown.