What I think you are describing is "shaker rod washer wear" that happened with the old style shakers on the first Chubby Stoves. The shaker post pivots between the bottom door hinges and the old style fire pots that caused the wear are no longer used. Last ones were made in the late 70s.
With the new style firepots and a double thick #8 hardened washer, it has been solved! The only reason I know this little tidbit of info is I happened to ask Larry about it when I was down there last week. I hope this helps. If not, don't be shy about giving Larry a call. He is the master and I am sure he can explain it and make better sense of it than I can! One thing is for sure the new style shakers are SWEET!