Kb, I did dig that roller out and tried the idea I had about using it to roll the edge of crimp ring.
Pictured is a before shot of a speedo I "hand" crimped then I run it thru the rollers tightening down a little with each pass and it definitely made a much better crimp.
It even took out much of the waviness from undoing the crimp to remove the ring.
I am sure I did not roll this ring flat before re-installing so it had the pry type of crinkles in it when I "hand" crimped back in place.
So, yeah,,, using something of this nature to smooth out ring after removal (like one I sent that was run thru this machine) and careful manipulation (and a helper to crank device) it will IMO do a very fine ,, near factory job.
And like I suspected a coating of rubber on the rollers for canister/ring protection would be the correct thing to do.
Also for grins + giggles a picture of the face plate on this speedo. It is a KPH speedo with a dial I had hand painted by local artist. odometer portion still clicked of KPS but the speed part was quite accurate when dive buddy Amy used it and we rode side beside on our Bigreds and could do a comparison of speeds.
I have long since upgraded her trike to a true MPH unit.
*yes, my picture detail stinks!*