Greg, I got a custom track extension and gate made by Tom Luque, at Mastgate. MastGates.com Tom was very helpful in designing and sending me a system that worked for the mast in my C&C35 II (original spar, 1974). He will certainly work with you to design something specific. I wanted to extend my track (molded right into the mast) below the opening so the slugs would slide all the way down to the boom. Basically he fabricated two SS pieces that screwed onto each side of the opening. In the end, I got a friend to machine two pieces of aluminum bar and screwed them into the mast instead, but I think the mast gate system would have worked if I had pursued it. I can provide more information and pictures if you contact me off-list.
Eric
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