We use a double bridle made of 1/2in three strand nylon, woven through two rubber snubbers and attached to the chain with a snap shakle. The bridle is brought over the roller and attached to the chain and then lowered until there is a loop of chain. The main reason we use one is to eliminate the sound of the chain dragging the bottom all night. In 20 years of boating in Alaska there have only been a couple of times I've worried about the load on the windlass due to chain snatch, but the rubber dampened the strain just fine. Unless your in a very windy or rough anchorage, the loads on the windlass, even with all chain may not be as big a concern as you think.
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