I would like to know the correct clearance/fit of the sleeve nuts to upper frame member and cylinder head bracket. I enquired of the spares Co., and they stated that the sleeve nut diameter was 0.498 +- 0.000, and the hole in bracket 0.516, these are thousandths of a inch and seems excessive to me, a clearance of 20/1000" ? I always thought the the fit was a tight location fit; say 1/1000" clearance? Please comment.