Paul, one way to make the thin plate idea work would
be to braze the thin steel plates to the aluninum. The
Key would be to put a thin plate on BOTH sides, even
on the end housings. You could also use the pin
through or bolt through without warping. Local hot spots
would still be a problem but could be handled with cooling.
I don't remember if this idea was mentioned before.
Bill Jepson

 
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