My AH 4000 pilot's belt finally gave up, with a deep crease and broken cords. West Marine has it, price down to $52 from $70. Found this in the archive: "Raymarine ST4000+ MK 1,2 I wanted to get spairs for the belt on the autopilot and found this bit of information that I thought I would pass on. Raymarine wanted $70.oo for the belt. I did some surching and found out the belt is a:TAPEZOIDAL TOOTH Neoprene rubber timing belt, .200"pitch, Trade SZ 300XL, 30" outer circle 3/8" W. I found that McMASTER-CARR 6100 Fulton Industrial Blvd. Atlanta GA 30336-2852 carries that belt. I got two for a total of $15.55 Their part number is 6484 K239 if you care. Their telephone number is 404-346-7000. John USNret" Well, it's a great reference, but I measured and examined my old belt, and it's not a match. The referenced belt is rubber, nylon cords, 3/8" wide, .200" pitch, 30" "outer circle." Mine is urethane, steel cords, 10mm wide, 5mm pitch, 750mm "outer circle." Close, but no cigar. The trade designation for my belt is AT5, for the pitch and style. Mine is marked "984 SYNCHROFLEX AT/750." Has anyone located the correct belt in the aftermarket? Should be in the $8 to $16 neighborhood. Thanks, jv
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