In order to screw on the ring, some of the threads from the audio jack must be exposed. Otherwise the ring would not be able to grab on and tighten. You don't need too many threads. Put the thread locker on those few threads, reinstall the ring and you should be good. Or put the thread locker on the inside of the ring.

Without the ring, the audio jack may have rotated and might have interfered with the audio wires, possibly kinking them.

Don

On Tue, 20 Apr 2021 at 23:23, Karen Lewellen <klewellen@shellworld.net> wrote:

The thing is that the audio jack threads are not exposed.
So, I would have to put this liquid in the case of the machine..which does
not seem safe under the circumstances.
Sorry about the misspellings, the synthesizer I am using is not fully
functional.
The ring cannot simply be placed back and screwed down?
i have no idea how I would use locktite if the threads must be reached.

---thread cut for brevity