Panflash, I agree, those T/C locks are quite reliable. I bought a used one for a song and dance to put on a scratch build for my daughter, mostly because I knew she should never have trouble with the lock. Only problem is, the outside profile of those locks are shaped "funny". When laying everything out, I was having trouble getting the flow I wanted, so I soldered some metal on the top of the lock and reshaped the profile. Made it straighter on top, and just a little thicker, to widen the stock in that area. Well, you can only do so much to the profile, but my daughter and I were happy with the results. Bill