Piper Aztec Pilot Air Vent Control Knob

thingiverse

This knob manages the upper vent of fresh air for pilot and copilot in a Piper Aztec F, and possibly other Piper models too; it is unavailable through Piper and hard to find elsewhere at an affordable price. OpenSCAD source is provided. The center hole may require enlargement with a 1/4" drill bit, while the dished top can be disabled by setting flatTop to 1 for better printing results, followed by adding a set screw for completion.