[997_986]

If you look closely at the connection, you can see grooves. This supports the strength of the connection through positive locking. Possibly (and I assume this) the grooves are worn out due to the constant movement. Tightening it more firmly will do little good, probably replace it with a new one or one that is good used. Or try an additional bolt, degrease beforehand. The weakest part is the ball socket (plastic), so don't worry.