After soldering the band is rounded up using my stepped ring mandrel. If you use a tapered mandrel care should be taken not to flare and distort the band.

Again using the step mandrel I bent the outer blank around a step 2 sizes smaller then the OD of the inner band. I found that using the smaller size compensated for the spring back and made for a good fit around the inner band. The outer band should be a snug fit at least half way around the inner band.