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rigging tension on a Nimble 20
Need advice on rigging and rigging tension: I bought a 1987 Nimble 20 (Nimble doesn't seem to have any manual or support as the boat is out of mfg for some years now) and have been working on it, haven't launched it yet.
Background follows: The boat hadn't been sailed for several years but is generally in good shape as I see it, despite the lack of maintenance. Note: Nimble 20s are yawls with a fractional main. The main only has a lower and upper shrouds and a forestay. In going over the boat I noticed slight stress cracking around the lower shroud deck fittings. I found the backing plates, which to my eyes were very small. I've installed fairly heavy 3" X 16" backing plates, using the original shroud fitting and picking up 4 of the hull to deck joint bolts. And am thinking about setting up the rig for optional running backstays if needed.
The rigging was very loose. I tightened all 4 shrouds (1/8" cable) to the same tension (using an aircraft cable gage). Surprisingly little tension put a slight bend on the main mast (from the forestay). I backed things off a bit and that's the best I can do with what I know. The shroud fittings are swaged and I am going to replace all the rigging with new wire and nicropress fittings. Needless to say I am going to launch this boat into gentle winds. Any advice would be appreciated.