You’re very welcome. Glad I could help.
I use Netfabb basic. Takes a while to learn how to drive it, but it has most of the features you’ll need to get yourself out of tricky situations like this. If Netfabb doesn’t have a feature you need, you should be able to find it in Meshmixer or Meshlab.
I’d love to know what that little doc-hickey actually IS. It’s a very complex design.