We have had our stove for 16 years and love it but over the last 5 years it has gotten leakier and leakier so you can not control the temp even with the air intake closed. This last year we could only put a couple of logs in at a time to avoid it getting too hot, which was a real drag. I've replaced the gaskets a couple of times and tested them with a sheet of paper to make sure they are sealing. I read that the cement needs to be replaced in cast iron stoves and am thinking this is the problem. We can't find anyone around here to rebuild the stove. Is it something we can do ourselves? Thanks for any advice.