I beefed up the mount - changed 10-32 144ksi bolts to 1/4-20 170ksi, and spacers from 1/2" dia to 5/8" dia. Calculated tensile strength goes from 2865# to 5389# (each of 6), and lever ratio drops from 27.6 to 22. Car gets its first shake Sun at Thill.
(IMG:
http://members.cruzio.com/~ablaine/stiwheelbig.jpg)