Roller
The Black Magic roller sounds interesting but where you purchased it (DDM), I don't think I know who that is.
Putting together another project using a Whizwheel Terra recumbent trike and plan a low mounted friction drive as part of the project. Collecting ideas and suggestions so here comes another question and this seams like a good place to ask it.
Dimention Edge has a friction drive kit that looks pretty good. What drew my attention is the ease of changing rollers. The mounting kit is a little pricey compared to the one at Bike Motor Parts, but may be worth it.
Has anyone purchased one of these kits, or looked into them. If so, What do you think?