Not a bad idea ... if you're lucky enough to find a cheap tap, pay shipping and wait a few days for it to arrive then never need it again. How many LCA's would a guy do in their lifetime ?!?!?

The washer trick is quick and simple and guaranteed to work. If you don't own a welder there's usually a shop nearby that has one - and will usually weld the washers on for a coffee.

Not knocking your idea, just saying that the "KISS" principle is usually best.