I found an old bicycle at the dumps that had removable pedals and crank arms. On newer bicycles the crank arm is part of the main sprocket. My brother machined some steel bushing so the crank arms would fit on the 1/2" shaft of my power unit. I finished the power unit and painted it. Next I have to redesign the seat. The lawn chair is not right for the recumbent position. I am shooting for a late spring launch. I'll keep you posted.