[Synchro909]

When I was in my teens, I watched my father shim the insert bearings in his very tired Austin. He switched top shells to the bottom and vice versa and used cigarette papers behind the worn ones (the ones with little loading) When more than a single layer was required, he cut the extras at decreasing lengths to get the tapering effect. He cut holes in the papers for oil after that.
We drove he wheels off that car for years but I think I'd use metal shim material which is available from 0.001" thick.