I was going to e-mail you on this but the thread is going along nicely - so
     > what say you on 1/4" steel and would mild steel with nitrite treatment do
     > the job ?
     >
     > I was thinking of attaching it at the centre and with about 4 stand-offs
     > bolted through the aluminium housing - the edge being supported by a ridge
     > cut into the housing  and held in place by the clamping action of the rotor
     > housing when bolted -up.
     > George (down under)

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

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