Matt then located the O-ring cutting tool 1/16-inch further away from the bore for the best seal with the gasket. Ultimately the cutter goes 0.033-inch into the deck and Matt makes each cut 0.003-0.004-inch at a time.
Matt winds out a length of 0.041-inch stainless steel wire to approximate the circumference of the groove. Before he begins, he faces the ends of the wire with a grinder for a flatter junction and then begins tapping it gently into place with a hammer of brass.