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I did the same thing to prevent wear on the cowl attach screws.  In my case
the screws are "Camlocs", and the washers are flat, not tinnerman.

I bought a removable pilot counterbore, which worked well, even in a hand
drill.

I just discovered the McMaster-Carr on line catalog.  They have a huge
selection of tools, with complete descriptions.  No minimum order, it looks
like a great resource.  They also carry gas springs.

  www.mcmaster.com

Bob Belshe
N19BJ
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Please send your photos and drawings to marvkaye@olsusa.com.
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