RE: O.S. .46 AX Shims
To call our local class 424 is not really true. We run .46 engines with any prop, on the short course.
If anything, I would call it 426.
Our rules allow the change out of bearings and shims. Also, the baffle can be removed. Shims can be made by hand, or trimmed from a stock nelson shim.
I try to help out the locals by giving them access, and all I get is flack. It would be different if our rules didn't allow this, but they do.