Many of us like to use tapestry looms or frames with continuous warping. This usually means that you have some kind of warping bar that revolves with the warp around the loom. This way of warping is helpful because you can weave something a lot longer than your loom is tall. But one problem I see on any loom with continuous warping is that the warping bar can become tilted as you’re weaving. If you don’t notice this problem, it can have consequences for how square your tapestry is. It is easy to miss the tilt as it starts happening because we tend to weave with something between the layers of warp. That makes weaving easier visually, but it also hides the bar from our immediate view.
Both the classic Mirrix looms and the Schacht Arras tapestry loom have this kind of continuous warping with a warping bar. You can also do it on any pipe loom. In the video below I demonstrate the problem and talk about how to fix it.