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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.