I don't understand what you mean by:
jumping off top string supressor
What are you calling the "top".
I'm not sure how they are making them now, but with mine you can pull the rubber off. When I set mine up I pulled the rubber off. The I lined the actual rod up with the string. I then marked the rod and "holder"(for lack of a better word). That got the angle where I wanted it. The I reinstalled the rubber, got the clearance that I wanted and then lined the rod and holder back up to the marks I had made. Might not be the text book way to set it up, but it's the way I did it and it works fine. Past that see your local dealer. good luck