I have a jeweler's saw. a few in fact. And blades. And lots of tools, etc. But I'm trying to figure out just how "easy" it would be to try saw a sliver off of the end of the roller with it in place. None too easy, in my book. But I'm sure Elcraft could probably pull it off. I like his suggestion of using a brass rod for the axle. A nail will just rust. Brass can corrode, of course but may be more user friendly. Finding the right diameter could be an issue but the bore through the roller could be adjusted with it out of the frame. Right now I'm trying to envision how I would hold the thing to peen, or "upset" the ends of the rod. Do-able, I think.

BTW, Pars, I remember those Junior High School classes! And the weird crap we made.
Do they still let kids do that kind of stuff? Hope so.