How do I get this bit off - sliding door

Hi all, I want to fit the trim that hides the sliding door channel but the mounting bolt on the front lock mechanism has snapped.
I’ve removed the two 15mm bolts from the plate, and it’s now wobbles but won’t actually part company from the van.
Any ideas or just a bit more brute force?


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Edit to add photo of the bit I mean.


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There is a small screw or bolt depending what someone has put in it that undoes from inside, it is in a recess.

 

Try not to lose it when you unscrew it. I've got a whole bunch of them nestling in the metalwork below.

 

Thanks guys, found it hidden behind the vinyl trim!

I even managed not to drop it, which is very unusual for me. Probably means I’ll lose it when trying to refit.