Hi Dave,
I suspect that this problem is combination of reduced caster angle (overcorrected by the 6-degree wedges so have put the 3-degree wedges in) and the tyre design.
Yesterday's test with wider tyre design gave some real progress.
I've been out to borrow another pair of wheels this morning ....what it is to have friends with CMPs (thanks James).
These wheels have the same pattern "round shouldered" design that originally caused the shimmy, so the test will be to see if they do the same.
All I can say is that I'm getting of of practice in changing 20" wheels 
__________________
John.
1944 Chevrolet C8a HUP ZL-2
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