I have been making some changes to my setup this year (longer auger, DHW coil install) and when fitting the new pipe/auger I reached in the pot and noticed that the pot bushing has ridges worn in it on the top side of the bushing. I have only ran the EFM for one season...is this normal? It seems that this bushing would last much longer. I have installed a new one before, so I know what I am up against, but it seems this bushing should last more than a season. I don't see my pot auger being bent (ran only the pot auger last year) so I am not sure what would cause this uneven wear on the bushing...Hopefully replacing the pot bushing won't become a yearly exercise! Anything else to look for other than a bent pot auger?