I'm no electrician so I couldn't make mine from scratch without knowing how it all worked first. I bought the kit from xdcycle (worst experience ever) that spinwurx made, actually I ended up findin out spinwurx stole the idea from raw designs & they got caught. Needless to say the pucs I bought broke after a few miles and I ended up having to repair them myself which led to me changing the design a bit too. So the puc's on my wheels now are made from scratch but not like yours, I used pcb but not the hard clad that you used, mine is green flex board & I cut copper rings to fit. How do you run the one brush? I have 4 brushes on mine and can't see how one will keep contact ? What keeps the brushes pressure against the commutator ring? I'd like to know more on how you did yours. I can tell you where to get the pieces I used if you care to know.