Install PTT in Cessna 152 or 172?
beans, shredded tissue paper, even tissuesYou can stuff it with scented dried herbs, then it could smell nice!
It's just a piece of 0.040 or thicker 2024 Aluminum shaped and bent with holes drilled in itYou simply drill and tap some holes in the top of the yoke and screw it inYou won't find any of these in a Parts Catalogue.
