I made my compressor which is similar to the Silentaire type. i bought a harbor freight pancake compressor,stripped the compressor and used the tank. Then mounted a used 1/4 hp refrigeration compressor on it. Ran a few copper lines,installed an unloader valve from grainger,muffler,pressure regulator with oil and water trap and walla- Silentaire compressor for under $200 bucks. Works awesome, quite, makes plenty of pressure and volume. If your handy its not too bad to make. I could take pics and go into greater detail if anyone is interested