They do a great job on soft balsa. As the wood gets harder, they don't work as well. On medium hard balsa, I've had them cut two slots, the blades seperated and each took it's own path.No wayto inserta hinge otherthan get out the picklefork and blow a big chunk of wood out the back inthe process. On bass wood, they are useless.

I had two of them. The first quit working after three hinges. Tower replaced it and told me not to send the old one back. I tore it apart and found the gears were bearly meshing, a little forming of the mount and it was back in business. I kept one wiht the fine baldes and the other with the "heavy duty" ones. After doing the third plane, I retired both. I used the Dubro pickle fork and hook for a couple more then planes and then went to Roberts Hinge points and havent looked back.

Iwould save your money and buy a jug of fuel.

Don