TW Acustic Raven AC Owners with 3-4 arms

I have a Raven AC  with (2) arms on the two back posts, the second arm was simple enough to add but I want to add a 3rd arm to the front right post which is above one of the (3) footers. How do you get the cap off? The cap screws/unscrews in either direction for a few turns but then stops. Do I need to break the table down completely to get the cap and footer off? Seems like it should be so simple but I obviously don't want to break my table either.

Any TW owners with 3-4 arms have any advice/insight?

Thanks,

Earl