RE: 2X4 GASSER SPAD
Here is what I did for a prop adapter. Drilled and tapped the original shaft for the cable with a 1/4 by 28 tap.(All I had) I then welded a 1/4 inch washer on to the shaft. (bolted it on before welding) I then dremelled some grooves in it to bite the prop a little. Balanced a there you have it. 5$ prop adapter. Still hasn't flown yet though. First attempt met with some interference (long distance taxi test)and hadn't had the chance to mess with it since. Maybe next weekend.