Thimble adaptation?

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Colleagues in Fire,

I currently have a 6" SS flex liner that meets a T at the bottom of our basement masonry flue. The T is inside the flue and the T connects to double-walled SS pipe into the basement area and then down to our wood stove.

The thimble in the masonry is formerly for an oil/coal fired furnace (long gone) with 8" exhaust. So I've got ~ 1" around the T-connected pipe. The escutcheon on the Double wall doesn't seal well against the brick chimney and there is a pretty good draft coming through somewhere.

I have some ideas how to make up that 1" difference but I am interested to hear what you all have to say.

Thanks for any advice!
 
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