A real quick note about the FM .23 crank. The Tungsten weights are just that, Tungsten.

We found during the testing of other cranks that not all use a Heavy Metal like Tungsten. In fact some used a brass or copper slug. Tungsten density is around 19 grams per cc, and the crankshafts we tested averaged 8 grams per cc. If you were to look up the density of brass and copper you would see they average around 8-9 grams per cc. Not much of an increase when you figure the difference.