Mary,

What I meant to say is that I am sure that it's a customary use thing. I think the basis of it is that we usually operate the tool with our right hand, and use the left to assist. When hooking the zipper at the bottom (with a right hand zipper) you hold the zipper car with your right hand and hold the tab with the left. And once you hook it you immediately shift fingers and zip the zipper right up (with your right hand). No having to change hands or anything. I think a zipper car on the left side is intentionally made that way for left handed people. Or possibly the factory gets a better price on the left handed zippers and never thought someone would complain about it because they may not have stopped to think about why it ould make a difference.

Did you call the factory to ask them why they did it this way?