To finish on a simple frame loom, cut the warp threads off the top of the frame, tie the two warp threads together, then weave the ends in through the back of your weave. If you don’t want to finish your weave by tying off your warp ends, see my post on finishing with the hem stitch.
How do I make my weave tighter?
While weaving, if the warp becomes too loose, you can insert a small wooden stick to tighten the tension. By inserting the small stick between two warp strands at the top of the loom, you can rotate it slowly and twist the yarns up. You will notice that the warp will tighten.
How tight should my warp be?
When warping your loom, you want to pull your warp thread across the loom with a tight even tension. Your tension should be similar to how a guitar is strung, so that the warp threads are taut, but have some bounce to them. If the warp threads are dipping down, then they are too loose.