re: Motorized Bicycle Take a Tip...Leave a Tip
here's another one for putting holes in gaskets;
find a bolt a little larger than the hole you need.
put gasket on hard surface, like a smooth concrete floor or the flat part of your vice.
center the bolt over the spot you need the hole.
whack the bolt with a hammer.
if you look at most bolts, at the end of the threads it's usually indented a bit, so it'll cut right through the gasket and leave a perfect hole.