The liner for this chimney is 8". I installed the damper on the side of the elbow which connects to the stove, but there were no clearance issues with the liner itself as I tested that as well prior to install. The damper was installed just above the connection to the stove.
I installed the damper so the control handle faced the front of the stove. To extend the linkage, I welded some 1/4" threaded rod to the damper handle just long enough to extend about 1" past the surround. I drilled a 1/4" hole in the surround for the linkage to pass through. I used threaded rod so I can easily remove the handle to take off the surround. I welded it together so that I wouldnt have any issue with it falling apart (pardon my welding skills, they are not very good)
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I had an extra 6" damper from some old pipe I removed from another stove, so I cut the end of the handle off and welded it to a threaded rod joining nut.
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Now I had a removable handle. I threaded a regular 1/4" nut on the rod first then installed the handle. I had marked the rod with nail polish so I could get the orientation of the external handle the same as the internal handle so we could be confident in the damper position. I used the smaller nut as a jam nut to hold it tight. With this setup the handle should not be able to slip out of position.
Here is the final look, I think it came out great.
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Overall this was pretty easy and really it didnt take long. With this setup I couldnt be more satisfied with this stove!