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I have a Ravelli tripod I use with my 70D.
The metal piece on the mount part (not the screw) fell out of it. While the 70D doesn't have a second hole, I do have an older vixia (like HFR10 I think) camcorder that I use as a secondary angle camera. It seems like a rather generic piece of metal (I see it on almost every tripod) that I assume I can order a bag filled with them on amazon, I would like to know what to look for though.