I had the same issue with my 100ks and use Powerfoot inserts and makes all the difference in the world and only $20. Check them out before messing with tongues.
Not to sound stupid but does it tighten without trying to put in steel? Alot of aftermarket steel is thicker. When I put in black Step Steel I have to make sure to bang in steel a bit or dial will not turn. Obviously if it won't turn with no steel then disregard. Lol