Abstract: A mast foot assembly for adjustably and releasably holding a mast to a mast track disposed on a surface of a sailing device. A base member is disposed on the upper surface of the mast track and has a pair of first bores at respective ends thereof disposed over the slot. It also has a central mounting portion between the first bores with a second bore therethrough normal to the upper and lower surfaces and having a first slot communicating between a side of the base member and the second bore. There is a retaining key member sized to slidably fit within the first slot in the base member and having a second slot communicating with an inner end thereof. A pair of nut members each having a treaded bore therein are disposed under the lower surface of the mast track. A pair of threaded members are carried by the base member and pass through respective ones of the first bores in threaded engagement with respective ones of the nut members.

Abstract: An adjustable footstrap for attachment to the surface of a riding device such as a sailboard, or the like. There is an inner strap member comprising a pair of centrally overlapping straps having provision for attaching outer ends thereof to the surface of the riding device and provision for adjustably fastening inner ends thereof together. There is also an outer padded sheath for covering the inner strap member between the outer ends. The padded sheath comprises a generally rectangular piece of a fabric-covered foam material having provision on facing opposite edges extending between facing opposite ends for releasably fastening the facing opposite edges together. The padded sheath further has provision for releasably fastening the sheath to the inner strap member.

Abstract: A pulley block system for releasable attachment to a sheet end and requiring no overhang beyond the sheet end. There is a first pulley block assembly having planar, parallel, spaced side portions and including a first pulley roller rotatably mounted between the side portions of the first pulley block assembly so that a line can pass over the first pulley roller. There is also a second pulley block assembly having planar, parallel, spaced side portions and including a second pulley roller rotatably mounted between the side portions of the second pulley block assembly so that a line can pass over the second pulley roller; and, interlocking apparatus for passing through the sheet to releasably interconnect the first and second pulley block assemblies with the sheet attached to and between the first and second pulley block assemblies.