How to Change Speargun Rubbers

A speargun rubber creates the thrust for the spear loaded in the weapon. The rubber is joined by an item called a wishbone, which can become dislodged or worn away over time. If this happens to your rubber, you can easily change it by making a new one yourself and putting it back onto your gun. This will keep your speargun in top working order.

Things You'll Need

  • Scissors
  • Measuring tape
  • Speargun rubber tubing
  • Wise grip pliers
  • Grinder
  • 2 retaining rings
  • Wishbone with brass slug beads
  • Needle-nose pliers
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Instructions

    • 1

      Remove your old rubber from your spear gun and cut it open with scissors if the line is still intact. Measure the length of the just the rubber tubing with a tape measure and cut the rubber tubing two inches longer than that measurement.

    • 2

      Hold each end of the tubing in vise-grip pliers and wear them down with a grinder until the points are tapered. The ground portions on the ends of the tube should be 3/4 inch long.

    • 3

      Slip both retaining rings over one of the brass beads at the ends of the wishbone. Hold the wishbone just above one of the beads with needle-nose pliers and push the bead into one tapered end of the tubing.

    • 4

      Push the wish 2/5 of the way into the tubing and then repeat with the second bead and the other end of the tubing. One-fifth of the wishbone should remain out of the tubing, connecting both ends.

    • 5

      Hold one end of the tubing in the pliers just below the bead within. Slide the nearer retaining ring down around the tube until it is at least 1/4 inch past the end of the ground portion of tubing.

    • 6

      Move the second retaining ring into the same position on the other end of the tubing. Fit the rubber onto your speargun by stretching it from the wishbone portion and putting it on in the same position as the old one.