Hello Everyone,
The ignition lock cylinder on my '79 rx7 is all seized up and will not turn. I have removed it from the car and right now am using a screwdriver to turn the ignition switch that is duck taped to where the ignition was. I would really like to fix this, any suggestions on how to dissasemble and fix the solidish cylinder, and if i need to replace it, where can i get a cheap one. There are a few on ebaymotors for sale but a little steep. Would a 2nd gen lock cylinder work as well do you think?

To Recap
My ignition lock cylinder will not turn out of "Lock"
I have removed it from the car.
I want to fix it.
Help!