Short version: My wife handed me her Taurus model 85UL and said :"It won't stay on the empty" (I know...I know..but she likes to have an empty chamber) So I take a look at it. Sure enough, while at rest the cylinder would spin right off the stop on that chamber and the next one too. The remaining three held just fine. Then I tried it in lock up. All the chambers locked up OK but one of the two described above felt like it wanted to slip off. I could not find anything wrong inside the gun. Finally I took my dremel and lightly hit the inside edge of the two notches that would not hold. I didn't really remove any material just kinda dremel filed it smooth I guess, and only inside the notch. I didn't take any material from the width of the notch, only the depth. I put it back together and it works fine now. Lock up is same as before except the one notch locks up better, and the timing is great. I'm thinking it's been this way since new and she just never had the empty on that notch before? Anyway, she does not get to carry this anymore. I'll be placing an order with my FFL as soon as she decides on the S&W model she wants.