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I am indebted to Brent for the MS21042 suggestion.  I bought a bunch of these
and use them exclusively whenever the plans call for a stop nut.  Whenever I
have to remove an already-installed elastic stopnut I replace it with an
MS20142.  Eventually I'll get all those heavy nuts out of the plane.

Concerning aluminum washers, I looked high and low for them and eventually
found them at the fly market at Oshkosh.  Sorry, I can't recall which vendor,
but I think it may have been one of those that advertises in the back of
Sport Aviation.

A note of caution which has been posted here before concerning substitution
of aluminum area washers in place of steel area washers.  If the washer is in
bending, as in a steel area washer under a bolt head spreading load out over
a plywood firewall, it's not a good place to use aluminum.  If it's purely a
spacer and thus only loaded in compression, such as those sandwiched between
engine mount pads and the plywood firewall, it's okay to use aluminum.  I
mention this example because there's almost a pound of steel area washers
under my engine mount.  I'll be replacing them before I fly.

I don't bother switching to aluminum for the standard washers (the non-area
washers), only the big ones.

- Rob Wolf
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Please send your photos and drawings to marvkaye@olsusa.com.
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