sqrldog, no the thing just fits over the drum. My best guess, until I can get at both rifle and tool together, is that I should just slip it over the drum and turn, the nipple being the thing that permits it to turn. Poor description, I know. Anyway the size will just fit over the drum.
It is occurring to me I was raised with too much influence from Grampa to speak with people today. At a restaurant I mentioned I had mislaid an old book by Jefferson Davis, which included some lines we would be criticized for trying to publish today. One man had never heard of Jeff Davis at all, his mother had just heard the name. I did not study this stuff in school. Grampa told me his " . . father had a hole in his breast you could put your finger in, that was from a minie ball" I can not even imagine how I would explain to modern guys what was a minie ball - something not even round - and why the hole would still be there. Or why someone shot Grampa's father in the first place. I can't even say "19th century" without people thinking it I mean just our last century, when Ronald Reagan was President late on. Any of you guys have this problem? Maybe it's true what Anglos say about the Irish. they never forget anything. Ever. Grampa was still a bit angry when he describe how the Brits treated one of us when a prisoner of war in 1777.