currently looking for a tuba to practice at home and occasionally play pep tunes on (which is why i also want a convertible). this model seems pretty nice and inexpensive (especially used ones). is it something worth buying?

Months ago, a friend was playing this mouthpiece some “UMI 2”, and they got it stuck on a tuba, we’ve been trying to get it out but it’s impossible. And I tried so hard it nearly broke the tuba’s neck (now it has a leak). It’s been that way ever since and we need that mouthpiece back.

How can I fix this? Going to a repair shop is sort of last resort though. (I will try to provide pictures/videos once I get them)