i had this problem with my scs. ok heres what you do. it works like a charm.
first you put the shim halfway onto your bars. next you snag your halk knuck and put it on the other half of the shim (so the shim can shrink to slide into the clamp). then once you have both pieces together-ish, just push down hard until they slide together. if you need pics, i can take them for you.