Re-Re-Re adjusting my Z bar trying to cure a Clutch chatter/start-up shudder problem in 1st gear. Trying to get the Z bar perpendicular (sp) to the block like it says in the manual. I cannot get the last bit of slant out of it. The frame bracket need to move slightly forward. Problem is the there is no (very little ) adjustment fore/aft being it is not slotted in that direction. Think it would be OK to scallop the holes out slightly (1/16-3/32) so I can get it perfect or should I leave well enough alone and hope it solved my chatter problem?