I'm not exactly clear what you mean by "one end open." You have a photo? I don't recall where I read this (maybe Xikar or maybe here), but you can lay the open cutter on a firm surface, place the head of the cigar in it, and cut. This will open enough of the head to smoke, and is usually how I cut either with the Xicar or the kinda cheapy Colibri one that came with the lighter and case combo I got for Christmas.

Hope this helps,

TampaSupremo