Looking at some of the current F18 (Hobie) boats, I see that they have one or two blocks on the FRONT beam to return the lines coming from the main spin blocks. Some make one trip up to the front beam...some make two (forming a "W"). All these blocks are Hexa-ratchets and running them forward and back gives them more wrap and more points at which to control the slack in the line (keep it from going overboard). Some complain that the "W" style has too much resistance in light air when gybing. This is probably cheaper than the micky mouse style blocks.