I'd send it to the tailor's, it'll only cost you a few quid. I believe that MittMayo does that service. I did have a shot at re-mounting mine which went well after a few attempts. But that was only because I bought a replacement and the court mount backing was too long, plus the ribbon was glued on.
You can find guides from websites for a small fee (£5) then try and find your own way of mounting it.