Well, I have to say Geddy was just a kid when he did that. He also, speaking of hacking up instruments, had at one time wired his Taurus pedals into his Oberheim synth so he could control it with his feet. He had MIDI years before anyone else . . .
The teardrop P was also the predecessor to the Steinberger. Man, he was always ahead of his time!
Seriously, though, I remember reading---in either a magazine interview, or perhaps one of their tour books---how he always felt like apologizing to the teardrop P for what he'd done to it.