Waleman, I have fixed this problem both ways, bronze bushing and peening the hole diameter. By far the easiest solution is peening. I peen one side of the hole, then press the nub on the tumbler through, then peen the other side of the hole and force, press, the nub back through the hole again.It will be tight but a little oil and working it back and forth will get her going.After hundreds of shots I can't see where it has loosened back up. It may sound like a cheap and dirty solution to the problem but it works and works well. Why L&R doesn't address this and many other problems is a mystery to me. Sales must be good despite these nagging problems, think how much better they could be with a little more quality assurance. I know they have lost a lot of my business, but I do a lot of left handed guns and many times they are the only game in town. I always make them work and have had no complaints but it still ticks me off.
Robby