I bought this Plank Bending Jig from MicroMark. I had forgotten all about it to be honest! Anyway, I’m using it now and so far it looks like it’s working pretty good. I suppose you can just make your own but I bought it to fill out my orders to over $75 bucks for the Free shipping.
One thing that I found annoying though. MicroMark gave you just enough of these little Washers to fit the Spacers. Well… I promptly lost one of the Washers and without it, it won’t tighten hard enough. So now I have to hassle around with buying some more!