For weights to be used to balance the crankshaft, Geoff says "the diameter of the weight has no significance. So long as it's round." Is not the important thing that the balance weight be symmetrical about the crankpin?
I used two 3/4" square bars of steel on a TR25 crankshaft bolted together with 1/4" bolts and added a nut on the end of each of the bolts to make the entire assembly symmetrical about its center. I drilled a hole at the centerline to ensure it stayed on the center of the crankpin and used a piece of aluminum beer can to protect the journal. Can't see that it needs to be round as long as the center of gravity of the weight is centered on the crankpin.
Last edited by koncretekid; 12/04/18 3:31 pm. Reason: changed 1/2" to 3/4"