Sony SLV-585HF VCR help

[Dan Schafer]

I am looking at an old Sony model SLV-585HF VCR. Fast forward & rewind are ok. The picture plays back & forth from very good to poor to no video signal (blue screen). I looked at the back tension band on the supply hub and it appears to be a little stretched. Just wondering if it is supposed to be a little loose or could this even cause my problem? I was thinking of shortening it a little and re-attaching it with super glue. Probably a hard part to get today? Is this question perhaps better for another forum? Thanks in advance for any suggestions.
Dan S