My suggestion is that if you are committed to building your own arrows, then buy a good crester. If you just have a desire to try it out, I would go with a quick and easy home made rig. I only occasionally crest arrows and I use a power drill to spin the arrow and two blocks to hold the arrow. It’s far from perfect but gets the job done reasonably well. My biggest breakthrough was when I learned the trick to use a C clamp on the power drill trigger so that you could easily screw it partly down and maintain a constant spinning speed. Whatever you use, good luck and have fun!