Join Date: Dec 2008
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When I rebedded my lowers, I took them all off, one after another, did the "drill out the deck hole a size or two larger then fill the hole with epoxy and redrill it for the chainplate" thing, then rebedded each with 4200. I don't think it makes any difference if the (relatively flexible) mast is pulled a tad out of column as you loosen one lower shroud, then another, but you could always go around all the lowers loosening each turnbuckle a turn until they are all loose enough to disconnect. And counting the turns as you go would give you an idea where you want them when you put it all together again...
When I replaced the bulkhead to which the upper attaches, I first strung the halyard to the stanchion base near the upper shroud chainplate, then lossened and removed the shroud.