The felt plugs are from Amazon.com. I use 0.093 diameter weed-whacker line. I make the brass end keepers.SGW, I like that set up. What did you attach to the end of the string to keep the felt plug on the line? Where did you get the felt plugs? I'd like to make to make one for my 22lr's.
And thanks for the idea.
I haven't used a bronze brush in .22 rimfire bores for over 20 years. The solvents available these days work very well to loosen up all fouling in the shallow .22 rimfire rifling. The plugs apply the EEZOX and then, after a while, the plugs will pull fouling out of the bore and leave a protective coating behind.