When I built my wheel it slotted straight into the frame, I fixed on the brake disc rotor and 9sp cassette to the motor wheel and everything aligned perfectly with the disc rotor - no special washers needed and the standard anti-rotation washers that came with the CST motor just slotted straight over the axle into the dropouts with no filing out required.
The only thing I had issues with was getting a hole drilled in the stainless steel torque arm to align with the available hole and cut off the extra metal to save it sticking out. Which in the end I had a local engineering shop do as I had no suitable bits or power tool to hand at the time. d8veh drilled it out a bit more for me with a carbide bit. I think cycleeze do some which don't involve extra drilling, but they are much more expensive and don't 'disappear' after fitting so possibly not as neat.
The only thing I had issues with was getting a hole drilled in the stainless steel torque arm to align with the available hole and cut off the extra metal to save it sticking out. Which in the end I had a local engineering shop do as I had no suitable bits or power tool to hand at the time. d8veh drilled it out a bit more for me with a carbide bit. I think cycleeze do some which don't involve extra drilling, but they are much more expensive and don't 'disappear' after fitting so possibly not as neat.
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