b"Mastbase & Cabintop BlocksPart numbers represent hardware most commonly used. A CTypical boat length:Small Boat: 6.7 - 8.5 m (22 - 28')Midrange: 8.8 - 10.4 m (29 - 34')Big Boat: 10.7 - 12.8 m (35 - 42') Diagram Small Boat Midrange Big BoatRef. Description Part No. Part No. Part No. B D1 HalyardA Mastbase 222 1986 1990B Cheek 2644 2606 3220 1 Halyard: This simple system leads principle halyards aft. C Single 2652 Used by boats under 9 m (30').D Flip-Flop 2142 3122 19873 HalyardsA Mastbase 222 1986 1990B Deck organizer 9001 9001 9006C Winch 20.2PTP 35.2PTP 40.2PTP A DD Single 2636 2660 1540E Stand-up spring 097 071 1634F Stand-up 2652 3227 32446 HalyardsA Mastbase 1986 1988 1990B Deck organizer 9001 9006 9006C Winch 20.2PTP 35.2PTP 40.2PTP FD Crossover1984 1981 BOver the TopA Mastbase 1986 1988 1990B Mastbase 1986 1988 1990C Mastbase 3002 3002 3002 3 Halyards: Larger boats use special mastbase halyard lead blocks. Lines are routed out to deck organizers then aft to stoppers and winches. Stand-up blocks on a base are sometimes preferred for their complete articulation, but they hold halyards higher off the deck than specialized mastbase blocks.C DA B6 Halyards: Modern race boats lead halyards and control lines straight aft through deck organizers so they can be used on either cabintop winch.CA BOver-the-Top: Special over-the-top blocks are required to route lines over an outside corner like the front of a doghouse or coaming. 264"