My top on my 67 rt convertible was redone several years ago. It was always way too tight. I was told it would get better, but it hasn't. It will not close under 70 degrees and above I have adjusters all the way out and basically have to stand on it. Is there anything that can be done short of redoing the whole thing?

You can take it to a reputable upholstery shop that specializes in convertible tops, and they should be able to adjust the vinyl to work properly. That is assuming the vinyl has not gotten brittle.

You could try loosening up the screws of the strips at the rear of the roof that holds the vinyl down to the car.

Vinyl doesn't stretch, unless it's deformed. It's more likely to shrink by heat and get harder over time. Specially if it's not under tension and folded up.

I have a vinyl bed cover on my truck. It most certainly stretches with heat. It's soft, and much looser, easier to snap on in the hot summer sun than it is on a cold winter day. When it's cold out, I have to pull HARD to get slack and be able to snap it in place.

I ment 'shrinks over time'. Not clear in my previous post.
Ofcourse it does soften up when warmed up.

I had a original top cover with my '65 Convertible. Probably hasn't been on the car a lot.
When you started mounting it on one side of the car, the other side came up 2" too short.

Ah. OK.

the bed cover was a christmas present. I had to put a space heater in the bed with the cover loosely in place until the heater built up some heat and allowed me to pull it into place and secure all the snaps!