i hear ya on all those points but the flywheels are free (i run a cnc plasma/oxy table) as for the belt i plan to run a pulley at the end of the shaft that way i can change the size of pulleys to change the speed until i find the right speed running speed. actually so far i have nothing for money into collecting the parts rack,pinion,2 bearings, flywheels, free! i will be ordering a keyed shaft from mcmaster carr.