I use a combination of sticks and heavy contractors paper, a turn of sticks, then contractors paper for a bit, then more sticks. (if you want a 20" width, you can cut off 20" sideways and then the 30" is the length.
I went to the lumber place and bought a maple1X8 or something 47" long and asked how many times and how thin they could rip the board. The guys took it as a challange and I ended up with a nice pile of warping sticks that only needed a little bit of sanding. I waited a polite interval and went back and did the same with a 38" board for my other loom. . Measure the warp beam to figure out the widest that will fit. Hard wood like maple works better than pine trim, or old vinyl blinds, both of which I tried and gave up on. If the warp looks funny on the back beam, you can rewind it in about the same time it took to wind in the first place. Nancy - looking out the window at the snow alternating with rain. An early winter in SE Michigan.
