Okay here is what I did. Murrays marine sells a smaller clam cleat for windsurfing booms. You may have seen one it is navy blue vs the gray that come with our MS booms. These blue cleats fit booms 100mm-116mm in circumference. Which translates to 31.8mm to 36.9mm diameter roughly.
Circumference= pi x diameter
94.2=3.14 x 30 the diameter of MS wave booms
102.5=3.14 x 32.5 the diameter of MS slalom and formula booms.
So with the above math, shimming the blue cleats is "doable".
I was able to shim the blue cleats onto the 230-290 by using 2 of the black rubber inserts under each cleat 2 per cleat 4 shims total. I have 25 days or so on the boom with no slippage of the cleat.
You could also use double sided tape- the thick black industrial type, or bike inner tube as shims. While these may not sound like elegant solutions they work and are inexpensive. Here is the link for Murrays Marine
Hope that is of some help.
Last edited by jason (2011-10-24 23:21:58)