I'd use a proper shim ie: the nitto kerley mention, or anything the right thickness. I've had problems in the past with beer can shims slipping, i'm still trying to forget that night...
I used to use rolls of copper shim at work which were available in varying thicknesses, not sure where you'd find any tho, so that wasn't much help, sorry.
Shim shimmany, shim shimmany, shim shim shroo!
I'd use a proper shim ie: the nitto kerley mention, or anything the right thickness. I've had problems in the past with beer can shims slipping, i'm still trying to forget that night...
I used to use rolls of copper shim at work which were available in varying thicknesses, not sure where you'd find any tho, so that wasn't much help, sorry.