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To Greg Nelson re: swapping dynafocal mounting rubbers around.

I have occasionally seen this done by mechanics on certificated airplanes to
cure unsightly spinner to cowl alignment. I was told that depending on the
condition of the bond of the rubber to the metal plate (no delamination) and
condition of the rubber itself (no cracks in the pucks that will be in
tension) there should be no problem. Seems it's a common practice for some
FBO's doing engine work.

The only drawback I can see (the above caveats being met) is if the rubber
has become hardened with age and heat. Then, you may not get the vibration
damping new rubber will afford. Can't say whether this is a problem or not
since that will be the case even before moving them around.

Dan Schaefer


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