Don't bother; I have updated my design because the bolt was causing problems. Give me a day or two and I can upload and updated video showing my second iteration.
+Chris Bright. Nope, never had a plate break on me, but I was very careful to make sure all my plates were actual iron. I have updated my design a bit though, using a piece of galvanized pipe rather than the bolt running through the center. The bolt lets the plates shift too much and bent after a fair bit of usage, but the pipe seems to hold up great. I would be more than happy to get a picture or two of the updated design if you would like.
yes please. i just saw your video and plan on making one asap. i have the plates already on hand. i also need to be creative to make a weight for wob and distance.