Replacing with CCMS composite reeds. There is a tiny stainless shim on one side and one side only of the reed block. It sat on top of the OE reeds. All four reed blocks were the same. One shim only. On the heavily angled side of the block. Have these blocks been gone into by a PO? Why one side only? Should I make sure they get back on top of the Carson reeds before the stop plate goes on? Thanks in advance. Kevin