I would actually like to use a rectangle O ring. There are mods I could make to it but I thought up a couple other designs while milling this today so I think I will put this on the to do later list. I will put a top on it and see how it works non the less though.
I said I would make another and send it to you but I don't think I will unless you want to try it as a GPU cooler for your new vid card.(EDIT I see you already have one so never mind!!!

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Also I found the cause of the vibration!! it is my top pully on crooked. It must have sliped a bit when it bound up. Going to fix that today. I will still send the holder though. You can size it up and if it works you can keep it in exhange for that software.
Hey do you want some 2"X3"X1/2" copper stock? I have about 10pcs. I am not going to use. No more Copper for this mill!!!