Footnote on Crankshaft Rebuilders. Did another search on Crankshaft Rebuilders. They use a new 50 Thousand dollar machine to polish their cranks. Their tollerances are much closer than you get with hand polishing resulting in less chance of bearing failures.For the money I would just buy the Crankshaft Rebuilers Crank from Advance.hey use a new 50 Thousand dollar machine to polish their cranks. Their tollerances are much closer than you get with hand polishing resulting in less chance of bearing failures.