>>A power drill works very well, and as far as cracking risks on a tub, use a piece of board(soft grain hardwoods such as poplar) that fits the area you are drilling on as a backing to prevent pressure build up and flexing of the tub.


When I've had problems with drilling tubs, it was usually not that type of pressure issue. At some point the tip of the bit would bite into the plastic, pulling/flexing it TOWARDS the drill and splitting it. A backing won't prevent this as far as I can see. Of course, I may have been drilling larger holes than most people need...
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What goes up must come down...unless it exceeds escape velocity.

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