Step By step pictorial guide to tying Speargun Rubbers.

Step 1. Make a loop with a simple overhand knot and seal the ends.

Step 2. Using a pair of pliers insert the knot into the hole in the
 rubber, some lubricant such as KY will help.

Step 3. Begin to tie a constrictor knot.

Step 4. A half formed constrictor knot.

Step 5. A fully formed constrictor knot.

Step 6. Begin to tighten the knot, you may need assistance with
this step.

Step 7. A fully formed and tightened knot.

Step 8. trim and seal the ends of the cord.

 

Step 9. Attach a Bridle/ Wishbone cord.

Step 10. As you can see the Bridle can be changed with ease
if it becomes worn, also the complete rubber can be replaced
with a handy pre-made spare should it be damaged or break.