I have a Pre-bored pipe kit that I want to make a nosewarmer poker with, and I went to order a short stem for it but when i took the stock one out and tried to replace it with one from an actual pipe, the mortise on the kit is WAY bigger than the others...I guess my question is.. is a kit built a lot different than store bought ready to smoke pipes? or do kit tenons vary? Thanks for your help.