Thanks for the instructions. I'm a bit too wary of my electrical skills to attempt that right now, but maybe in the future.
I discovered that with pliers I could turn my aquarium heater control post past the stop. Problem solved! Or so I thought. It actually didn't make a bit of difference. I was left with only two choices-try to force the trim screw past its stop, or put it back together before I ruined a perfectly good heater that serves me very well for B&W. I chose the latter.
I think my next step will be to try a Wallly Mart heater which we already know can be MacGyvered up over 100. If that doesn't work I'll revisit the home-brew idea.
But what I would like is a simple control with a probe, that I can plug my existing metal heater into without having to hard wire it. Then I could just leave the heater's probe out of the water and let the controller's probe turn it on and off. I'd gladly pay a few extra bucks not to have to wire one myself. But I don't want to pay 75 or 100.