Thanks. I used a case hardened bushing that fit snug in the hole. I had to drill the hole to the size of the bushing. The bushing is approximately one inch in length, just long enough to be flush with the inside of the stove body. The bushing is also thick. I would have to measure the thickness and post it since I don't recall the exact thickness. I first welded the bushing to an 1/8 inch thick washer. I welded the entire thing into the stove. If I were going to do this again, I would drill/tap the stove and bushing in order to hold it in the stove. I did this on my Chubby Sr.
With this design, I have planned to use a two piece shaker rod system. The tolerances between the bushing and the shaker rod are very very close and the length of the bushing will not allow one to feed the bent end of the shaker handle through the bushing. I felt it was better to go with a two piece rod and have tight tolerance between shaker rod and the entry point of the stove compared to a single length rod with much less tolerances which also would have prevented me from using the bushing. Since the bushing is case hardened and the rod is not, several shaker rods will wear out before the bushing.
I will try to take a pic of the bushing from inside the stove since it can not be seen on the outside due to the thick washer covering the end of the bushing and the entire unit is welded into the stove. As with my Sr Chubby design the handle will also have a chrome spring on the handle which allows the shaking without a glove and without fatigue in the hand. I will post some pics of this as well as soon as I finish it. I did pick up new gaskets for the door and will install them this weekend and try to make the shaker handle assembly so I can test fire the stove. I hope this helps. If you have any questions just drop me a pm or post it.