Can't get my heat exchanger tube cleaner to slide across the tubes. I left the stove on high all night due to our cold snap. When I went to clean the stove the next day I can only move the left side tube cleaner about 1/4 of the way, then I get some kind of resistance. Never had this happen before. I don't want to force it. Anyone else had this happen? Suggestions? I can't get the baffle off because PO broke the heads off the bolts.