I wanted power windows for my 66 dart but I"m cheap!

Jim Lusk said

I've considered the same thing and did mess around with some motors about twenty years ago. You don't need to remove the spring IF you use a bolt to hold the regulator from moving. You might have to drill a hole through both pieces on some regulators. I still have the spare 67 door reg with the bolt in place somewhere around here.

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I put the spring back on after I mounted the motors, but forgot to take it off BOTH times when I drilled out the crank handle and gear. on the second one it was a DUH moment, as soon as I put the screwdriver under it to pry off the mechanism I wen OH S!@# and remembered that I was supposed to unhook the spring. I'll try the bolt trick on the rears though. I have then both out and ready for testing to see if I can find some small motors.