I'm talking about a chimney damper, round cast iron with a rod on a spring, controls the exhaust flow up the chimney. The instructions said to install in the first section of pipe, drill opposing 1/4 holes in the chimney, disassemble the damper and thenre-assemble in the chimney. The spark arrester that came with the stove is just some hardware wire that appears one slides over the top of the chimney.

Coal is also an option, might take some work to find a source though.

Bugs.