Reusable Foam Air Filter

Here’s a way to make an inexpensive, reusable air filter for your glow engine. The porous foam element (which can be cut off a lawnmower filter) can be removed, washed in gasoline, soaked in a light oil and then put back on your engine. You’ll need: (A) 6-32x3/4-inch machine screws; (B) 1/16-inch-thick aluminum top plate; (C) 7/16-inch-long brass tubes; (D) 1-inch-thick, foam-plastic filter; (E) ¼-inch-thick aluminum plate; (F) 6-32x1/4-inch setscrew. The hole in the lower...