Thanks very much for your responses. The reason I would like to have a RRS clamp is that I already have a L bracket from RSS. Reading several sites on balleads most people are suggesting to use a clamp from the same manufacturer. Seems that not all plates are fitting nicely in clamps made by other manufacturers. I prefer a lever clamp / flip-lock. I agree it would be even beter NOT to replace the clamp if the bracket would fit perfectly in the original clamp from either AS or Markins.