Russ, please see the attached files for the mast/boom setup installed on my boat. The hand drawn dimensions are fairly close but not exact due to the mast/boom in its down position. The basic construction is 1/4 " thick, 1 1/2" wide piece of aluminum strap 16 " - 20" long (approximate), formed into a "U" with the top wider than the bottom welded to an aluminum pipe 1 1/4" OD. Allows for the holding of the boom which is approximately 3" wide. There is a length of rubber with the same dimensions cemented to the inner side of the crutch for boom protection. The support pipe is 45" long with a notch approximately 3/8" wide and 1 1/2" long cut into the base that is used to fit over the welded stainless steel linch pin that is welded to the stainless steel vertical support of the boat hand rail. The linch pin is welded approximately 2" up from the vertical support base allowing for 1/2 " clearance from the deck to the crutch support pipe end. If you have any questions, let me know. The support pipe is also secured to the vertical hand rail support with a couple of SS clamps placed evenly.
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