There is an elastic band, that has a screw, that holds it to a piece of the frame. If it isn't to far stretched out, it can be adjusted/tightened. Put the top in the service position and look for the band in that general area. The screw is very small. Don't drop it into the oblivion. The band is +/-0.500" wide. I adjusted mine and it worked for a while. The elastic stretches out.
Here is a YouTube link;
https://www.youtube.com/watch?v=RWLUTbetkYI