To install the damper you will need to drill (or punch – a tent spike will work)  two holes in the stovepipe make the holes just large enough for the damper wire (punch these hole directly across from each other). We put ours high up in the first section of stovepipe – just far enough down to not interfere with the second stovepipe.

Then take the damper apart (push on the handle and turn notch to clear position) wiggle the bent pin all the way out of the black plate. 

Insert the black plate into the stovepipe and reassemble.

Note the spring goes on the outside to provide pressure to hold the plate in place.  Large spring is meant to stay cool so you can adjust the damper.