I have removed the tumbler by drilling and the use of my dremel, I used a cut off wheel and took the outer most portion of the collar, then with some prying, tugging, and a few choice words (glad its not sunday), I got that portion out. All without ever getting that #$#@ black so and so off. I can see the prongs that are suppose to move in or out? but the drill got to them so, I still have not gotten the collar off. Now to make maters even more frustrating, I can't put the outer ring back till I do get it off and replace it. The new tumbler is in but no outer ring she will just have to make due till I can continue,after I get the new collar. I wonder though If I will have to replace more than that because I messed up the release pins????