[TowerTalk] Pinning mast?

[K7LXC at aol.com]

Howdy --
 
    I've got a sloppy fit between a mast clamp and a  mast - both steel. It 
won't shim properly so I think my only option is to pin  the mast. I've 
done it a bunch of times and mostly they hold butr  sometimes they don't so I'm 
proposing to use 2 in one direction and  another two 90 degrees from the 
first two with good-sized high strength  bolts. Other than the challenge of 
doing it at altitude, is there anything else  I should be considering? Or is 
there another way to do it? 
 
    This is a prop pitch with big antennas on it.
 
Cheers,
Steve    K7LXC