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Apparently the Plastico Machines Corporation is out of business or in Mexico. I was looking for a booklet for it. Is that the exact one you bought?

I just looked at the photo - the knob is for placing where the top hole and bottom holes are punched. Use some scrap paper first to make sure they are even and then tighten the knob in the right spot and don't move it. Kinda like a three hole punch.

Quote: The combs come in all different colors too. We buy the covers and combs to match. Sometimes use the clear front cover and matching back cover.

You can use any size combs. I have no idea about the knob, but we use ours for anything from 1/4 inch to 3 inches. The length of the comb never changes - the size is around not length. So if you need to bind something that uses one ream of paper you need a 2" comb.