A simple Bosch relay and a momentary-contact push button switch can be wired with a self-holding circuit to provide the operation you describe. If you will send me an IM with your email address, I'll draw up the circuit and scan a copy to you.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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