i have a homebrew bead roller.. made it last year as a project but hasn't had much use because i only had one die set: 1/8" round bead.

i've since made a few more dies (1/8" step, and a "tank roll" cause it looked neat)

i'm having trouble keeping things straight, though. most of the stuff i'm rolling feature into isn't straight, so the backstop isn't particularly useful.

but say i've got a 10" diameter round blank of thin sheet, and i wanna roll a "tank roll" edge all the way around (basically a 3/4" flare).. how the heck do i keep it from getting all waaaavvvvy?

next set of dies will be a 3-set hem roller. looks pretty straight forward.. 90degrees, then 140degrees, then flat. Q: can i use this for putting in a wire?