Ron,
Here\'s some of my experience with Carrier & Bolts.
The .002/.003 works very well on the units I\'ve made.
Maybe .001 between the flats.
The flat area closest to the Carrier bore will wear down
pretty quick because of the cam follower being pushed
off center from the opposite side, but will almost stop wearing
when the bolt/bore tolerance is reached
If you have for example, .008 between bolt and bore
you will see much more wear in that area.