I had the same prob with that lining. I burned it out three times, tried the wire wheel, then broke down & got my oldest boy to sand blast that puppy
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__________________
Dave Compton
KCBS MasterCBJ # 22569
KCBS BoD Judges' Advocate
Possibly the only judge ever to get an award from a bunch of cooks 
UDS 075 UCB WSM and a bunch of other stuff.
The above post is only my opinion - mine & mine alone.