On many boats the windless with the gypsy head lower or even with the bow roller, mine included. This equates to only 1 of the teeth firmly grabbing the chain. The higher the windless, more teeth will grab and reduce or eliminate having the chain jump a link or two. I sometimes wear a leather glove and depress the chain just ahead of the gypsy. I know this is a bad practice, but until I raise the windless it helps prevent a runaway on the chain.