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How did you set up your test jig? I've been looking into build/setting up something similar in my garage for testing different knots and lines as well. I've lost to many fish from knot failures...
Gorilla duct tape, taped on to itself to form a double sided non adhesive tape to wrap around the PVC. It is held in place by rubber band. The non adhesive double sided Gorilla duct tape gets replaced when worn. It only serves as a cushion.
What did you use to wrap the pvc with?
You need two large 4 inch PVC arbors as shown to decrease stress on the line so that your results will be close to true actual breaking strength. For simple testing at home where you want to test your knot strength, just leave the braid on the spool that it comes with and tie it to a stronger mono, attach mono to spring scale and pull until it breaks. Of course this limit you to 30 lbs and under test for safety purpose. Wear eye and face protection!