Towels make a good project to work on selvedges unless they are being made to sell. Technique can be worked on, and it still produces something useful. I have found that it only took part of one towel to start getting a rhythm going, speed picked up, and once I fixed the crossed warp, I haven't touched the selvedges. The paperclip temple has also helped keep the towel from drawing in as much. What a quick, inexpensive fix. It should be visible in the following photo.
To use, just spread one leg of the paperclip out a little and hook it on the edge of the fabric.
I attached some heavy linen rug warp and heavy fender washers to the clip for weight. They drape over a thick cord tied to each side of the loom.
I have seen photos of others using alligator clips instead of paper clips. I would probably do that if I was working on something with very fine threads.
I've started the 4th towel on this warp. I'm using up some yarn that I dyed. The quantities are small, so there will be a lot of color changes. I hate doing yarn changes, but I like how it looks when it's done. The start of it is to the right.