When I received the rebuilt Bendix throttle bottle from Airflow Performance (AFP) I also order an air filter and the flow guide to attach the filter to the fuel servo.

he strange thing is the flow guide has a 3.25” flange and the K&N filter they sell requires a 3.5” flange. I ask AFP what I should do and they really didn’t have an answer for the issue. I was told to just cut a piece of PVC pipe and use the ring as a spacer to fill the gap… Yikes! do people real do that sort of thing on their planes?

Amazingly, I happened to have some 1” AL stock of the right size and decided to machine my own flow guide.

That 1” AL is really thick and difficult to work with. After cutting the block off I needed to remove the center to make a hole.

Next is is spending a bit of fun time on the lathe.

Four hours later, I had a new flange with the 3.5” flange I wanted which was basically free. Now I’ll return the $135 air inlet back to AFP.