I already had a PRS-20 for my road bikes and I love it. Unfortunately the new 29'er I bought has a 15mm thru axle so I couldn't put it on my workstand. Sure you can buy an adapter from Park for $60 but why buy it when you can build it!
One day when I needed to hit up the big box home store ( I think I was at Lowes) I took my axle with me and checked out the steel supply area. It turns out that 3/4 tubing has a pretty close ID, I think I got 16ga or so, which IIRC is about .065 wall. From there I just needed some 1.5" square tubing to fit over the arm of the stand. I think Park uses 16 ga for this piece but 14ga should work too. 1/8" (11ga) might work but I think the ID would be too close to 1.25" to fit well. I found my chunk in the steel supply house's scrap pile so that's what I went with.
Cut the tube to 100mm, or a little more and finish off the ends to come up with a finished length of 100mm. Cut the square tube to length, in my case 6" and drill a 3/8" hole in the side so you can weld a nut for the knob to screw into. When you get it all cut/drilled and cleaned up weld it up and hit it with a little paint.
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