Vmxhannah960, To answer your question, crankshafts are balanced by adding or removing weight, the crank configuration remains unchanged, the balance factor as a percentage is different for the rubber mounted Commandos than for the solid mounted Atlas, or any other solid mounting application. If you send the crankshaft, con rods and pistons to a balancing specialist for dynamic balancing and tell them what balance factor you require, they will do the necessary. The last one I had done cost me less than US$100.