few things to keep in mind the springs on the arms do need to be replaced at least every 50 passes,,,,,,,, i had 2 of them break and end up in my pan,,,,,,,,,,,,,,,,,,,, my bike rider combo was about 700 pounds and i went 1.32 60s,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, but had a verry hard time duplicating a 60 foot time,,,,,,,,,,,,,,,,,,,,,,,,, and i seemed to have better luck keeping the air gap on initial setup at .090 and i also did away with the shim packs and actually machined the center hub down to get my .005 with the bearing in place,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, and also took the stock inner basket and put it on a lathe and turned the lower fibre contact area to make it flat with the center hub,,,,,,,,,,,,,,,,,,,, its a good setup but i wander if the mtc although much more expensive is more consistent on the 60 ,,,,,,,,,,,,,,,,,,,,,,,,, or if the 6 arm is more consistent