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Sven Yrvind fabricates a custom fiberglass mast collar to waterproof the deck-stepped mast on his small, shallow-draught boat intended for Southern Ocean transit. To prevent water ingress during potential capsizes or pitch-poling, he constructs a sleeve designed to fit over the mast base.▶ 2:36 He begins by wrapping the mast with five layers of insulation tape to create a base, then applies nine layers of 450-gram fiberglass cloth over the area.▶ 3:31 After the epoxy cures, he removes the hardened sleeve from the mast using pliers.▶ 5:55 To ensure a precise, concentric fit, he removes an obstruction at the base of the mast using a custom-ground chisel.▶ 6:53 He plans to fill the remaining gap between the sleeve and the mast to achieve a watertight seal.▶ 8:46 The process demonstrates a method for creating a custom, removable fiberglass collar for mast-to-deck sealing.

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