Is my regulator stuffed?

[Patrick_BCB]

First time kegging with this setup so I accept its probably user error,,,

But when i turn the gas on through my Keg King III dual gauge regulator the gas goes unregulated through to the keg at tank pressure even with the screw in tap completely removed.

I tried to disassemble but don't have the right tools for the job. At a glance the bell thingo the screw depresses is loose and rattles - I expect that this should be pressed flush with the spring?

 

[MHB]

Bigger problems than that, when something is wrong Regulators should shut off (no gas) rather than on.
There is a needle and seat valve under the diaphragm, sounds like that is not working (or missing).
Mark