My 73 w/ electric sunroof doesn't slide. Unzipping headliner reveals that motor spins, as does worm gear out of it but center gear in the drive does not. Looks like the worm gear is stripped. So, I need to source a motor and drive assembly. But I suspect that is only the start of my issues because the PO said it worked when he got the car but started jamming up. Spinning the drive center gear does nothing to the sunroof now but it eventually stops spinning so I am guessing the cable is engaged and getting to the end of its length. I suspect that the cable ends have broken so it needs guides and cables too. Problem is, I've never worked on one before and all the previous posts I've seen already have the headliner out. I assume I will need to remove the headliner? Any tips on that without ruining it? Seems like getting it back in under the rear window gasket might be a challenge. Then there are some wooden panels under there. I assume everything will be obvious if I get that far? Any help is appreciated.