The "different" with the pics didn't work. Can't see them.
Here's an image from another thread about stitch patterns. I like the 100% pattern. It's really easy to do the w's, just forward and reverse angling the webbing a little bit each time. Sharp needles will work better. If you're getting a mess of thread underneath, the thread tension needs to be adjusted tighter.
Don't know how you would test the breaking strength without the proper equipment. You'll find out if it's poly or nylon if it stretches over night. Nylon will stretch, and for that reason doesn't make the best straps.
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