Rcnicholl Why dont you begin by looking at that rod to be sure its not bent,look for dirt under the bearing halves,look for a shiny spot on the bearing (tight spot) mike the rod throw for size,I wouldnt shim a precision rod cap-it might spin the bearing. If that turns up nothing tighten it up a little at atime to see if it locks it up. If the crank is too big you could emery cloth it (which I would hate to dofor losing precision reasons) however in the olden days they almost all done it !! Not impassible its not the right cap ,may be on backwords/ If you get past all that check clearance with a little square of a.001 feeler gauge deburred with emery cloth. Dont roll it thru just see if it will move then a .002 same way just move it . Good Luck !
