Thanks!
The car has actually lived it's entire life in Arizona (2nd owner since '81, numbers matching with data card). Just brought it out East to get it road worthy again and will probably put it on the market in a month or two. Having fun working on a few things and haven't seen the soft top in over 20 years (until today). I'll work on the joints again tomorrow and report back to the forum.
If anyone has had the same problem, by all means, let me know what worked for you! Thanks, in advance.