In the video it says to put on the length master and tighten down the bolts for a snug fit.
Do I continue to tighten down until there is no slippage when I pull on LM?
I am just concerned about tightening too much because it is a powerful tool.
Tighten it down so there is no slippage will be sure there’s no pain. If there is pain there’s nothing wrong with the device or what you’re doing as far as stretching is concerned, if there’s pain is the wrap itself. For me finding a wrapping technique was so important to putting in hard work. You should be able to find a wrapping technique that jives with you and gives you the ability to take full advantage of the LM strength.