https://photos.app.goo.gl/z8xUXfB7NsnxuBa66
Here's how I connected my tubes, 5mm dyneema cord formed into a loop and then joined with 2 double overhand stopper knots. I did chamfer the holes but I have noticed some abrasion to the cord, I have a lot of it spare so I can afford to treat it as a consumable, at least while I tinker.
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