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				| Here's my solution
 I simply removed the F-719 stiffener angles after marking and outlining the position of the plastic bearing blocks onto the stiffeners. Here I put a couple of C clamps on the on the block and the angle to hold it while I drilled the holes into the angle, using the plastic blocks as a drill guide. I put some oil on the drill bit to prevent the drill from binding inside the plastic and possibly removing any more of the plastic.
 
 
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