That first one I posted looked a little sketchy to me which is why I went with something different. I was told that a lot of people used that setup year's ago. :schreck:
We modified this lower cost one. Broached extra 1/4" keyway, machined register, drilled and tapped ce19 pattern. Then I decided to use a River Rat pump and could'nt run this damper lol.36446