I saw where Amazon has some wheel collars in bulk and was thinking of getting some of those. However I did not see the ones that look like acorn nuts but are held on with a set screw. I know Brodak sells sets but I was looking for something in bulk. What exactly are the acorn nut versions called so I can see if I can find those in bulk? I am looking for 1/16", 3/32" and 1/8" wire.