I just installed a Harken 009 ratchet block on the deck lip over the cockpit. When I purchased the block the salesperson looked at the eyestrap of a brand new Sunfish and noticed it did not have any backing plate or block. So he said I probably wouldn't need one unless I planned to do some extremely hard sailing. However, just to be on the safe side, I installed two very large washers before putting on the lock nuts. Does anyone think a block is absolutely necessary for the eyestrap?