I had the Bimm 2000 combi system when new..not precise--not so good. Eventually I turned the s.s. tubing "stirrup" around 180 degrees in front of the mast and used it for the diamond wire tensioner. Worked fine at 10:1 downhaul.

Later I got several aluminum or s.s. stirrups off old aluminum A-cat masts and used them on CF masts. These old designs work just fine, even better with tiny double bullet blocks and small line. But larger triples and quads are a nuisance in small spaces- do not use them.
9 inch long x 2 inch by 1/8 inch thick aluminum plate works fine- 2 pieces bent into a shallow Z, lightened by drilled holes. None of mine ever broke.... except the first one when I went out in a blow, when two very old, poorly-fastened rivets in the downhaul DID come off the aluminum mast..... Twang-CRUNCH... Splash.