George,
The thick plates should work fine. I believe the thin, (aproximately

1/8),

plates applied to both sides of the housing would work also. Pins
through would hold them in place. NItride treatment of the plates
would be the way to go. The factory has nitrided the side plates on
stock engines. I would not put the ridge around the outside. Simply
capturing the edge as Paul has indicated on the ACRE website would
be best. A captured edge (with a ridge) would put you back in the
warp problem.
Bill Jepson

Bill,
Just a point of clarification!
The ridge I was speaking about is in the aluminium housing to support the
steel (wear plate) and acting as a clamp between the rotor housing and the
end housing.

Do you still feel this would cause a problem, or do you feel the steel has
sufficient strength and should float freely at the edge.
Confused!
George (down under)

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