A rocket powered witches broom for steampunk or whatever. The broomstick holes are 30mm. The shims helped with my 1 1/8" broom handle. Cannister smoothed with fiberglass resin. Tubing taped with black athletic tape. If desired, you could connect a small hose between the tanks. The hardware store would have lots of options. I decided the fuel really flows in the broom handle.