Posted for "David VanOsdol" <vanosdol@quixnet.net>:

 I had the same problem and solved it with a Hex socket head bolt.  I also
 picked up a selection of ball head allen wrenches.  Using the ball head
 wrenches allows you to tighten them from an angle.
 
 David VanOsdol
 El Dorado Ranch, San Felipe, Baja CA, Mexico
 vanosdol@quixnet.net
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