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i'll stay with mechanical. its worked for years. thanks guys for your responses. let me know about the hampster powered pump, sounds innovative.
Yea, I have temporarily suspended research since all of my hamsters have died for some reason... but PetCo will have more in next week.
I have found that when you apply just the right amount of heat to the wheel, that the little buggers will keep running for a really long time, with little or no training required.