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I'm guessing these shims are associated with a layshaft roller bearing, since the standard gearbox doesn't have any?

I found the end-float increased over time because the shims are acting against surfaces which weren't designed for them.

I gave up on the idea and fitted a 6203TB phenolic cage bearing as per Mick Hemmings' recommendations.

It restores the positive location of the layshaft and tolerates the layshaft flex which destroys standard bearing cages.

If anyone wants a cheap layshaft superblend with very little use you're welcome to it.