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Why chisel out the existing phenolic at all?  Could a person do a little of
both suggestions here and keep the existing phenolic block in, but knotch it
back so that you can also install the full card in front of the existing
block and bond the full card to the new face of the existing block and the
bottom spar?  It would be a good template for drilling the new hole.....are
there any problems with that?....I know nothing of mechanical
engineering...but it seems to make good sense to me.

Curtis Krouse N753K
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