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I have a very simple question. I see on your videos, that I like very much, that when you tie onto the front apron rod your tension is good and the wooden rod doesn't bend. I know you said in the video that the shape of the wood helps to keep it firm and straight. However, when I tie on to my wooden rod, which is fairly stout, it bows towards the cloth beam/front of loom. I have tried buying steel rods and they do the same thing. So, question, am I just tying it too tightly to begin with and should I just tie on and them let the tightness come from the tension I create with the ratchet and a bit more tightening of the warp onto the back beam?
It sounds like maybe your warp tension is very tight for it to cause bowing. Have you tried loosening it and seeing if you still get a decent tension to weave? The tie on to your rod shouldn't make a difference as long as it's tied on evenly, or that's how I'm thinking.
Another thought - is your rod lashed onto the apron on your cloth beam, so that it's held firmly as you tie on your warp? If it isn't - that might also give it a chance to bow.