da Rock

Here are a couple of pictures that're worth a thousand words.

I made this jig in about an hour with about 5 minutes work. It's made from scrap plywood and scrap wood that was lying around. I pieced it to avoid having to route the slot and to give the sanding block locating flanges.

It's the jig I use for the size props that're marked at the holes. It can also be used to make accurate "flared" prop tips. I slap a strip of masking tape on it and pencil in aligning marks for one blades angle and can easily and accurately align the other blade.

Accurate work is often the result of a special tool.