In a PM to me, Stitcheroo explained his set-up for sewing welts and everything else to me. He has a right handed zipper foot that has the part of the foot the needle goes down through ground off to let the needle get closer to the welt cord. There is absolutely nothing wrong with this set-up and it would work fine. This set-up would be more beneficial to an experienced sewer. I thought he was advocating modifying a presser foot, which would have been bad advice, but that was not the case. So......Stitcheroo, I owe you an apology. Sometimes I find evil where there is none, and this is one of those cases. I'm sorry.
No one lives forever, the trick is creating something that will.