How to Build a Lego(R) Chainsaw

Having seen a 'chainsaw' instructable which was not a chainsaw, I started thinking. I had some Lego bits, including:

A motor (4.5v)
Some gear wheels
Some chain links
And some other general bits.

These parts are required, as pictured.

The tricky part was the saw teeth...

These are the most tricky part, which is why I started on them first.

If you examine Lego chain-links, you will see that they interlock with pins spaced 6.5mm apart. There's enough clearence to get something very thin between the joints to be fixed on the same pins:

Aluminium beer-can, easily cut with scissors & sharp knives (do be careful).

Tools:
A hammer
A knife blade
A piece of stiff wire (from an umbrella)
A picture nail
An abrasive stick (coarse corundum, probably)
A piece of wood

Please view the pictures for the method.

It's best that you work this out as you do this.
Mount one tooth on one pin of a chain link, and secure it by clipping another link over the top.
Then mount the other hole on the tooth on a third link, and clip it to the first, securing the tooth.
(If anyone gets this far, and I doubt it, they'll work it out)

I'm not going into details, this part is relatively easy.
The pictures should give you enough information.
I started with a direct-drive from the motor pinion, but later geared-down (intro picture). However, direct-drive off the motor works best.

Some paper was shredded, but there was some slippage where the steel motor-shaft should grip the black plastic pinion.
Weedy, but concept proven.

Some glue on the motor pinion and this was pretty effective on broccoli.
Success!