I have a Cushcraft XM240 at 90 feet which, despite double lock nutting and Locktight, rotates on its own several degrees in high winds. The first time it did this the beam descended about a foot on the mast. Cushcraft has no advice. Does anyone know of a boom to mast clamp assembly that is more secure than the original??? Tnx for any advice. 73, Chuck, N8CL