heyy i got a marshall cab, mg412, not amazing but meh :P

anyway the input at the back has kinda popped bak, into the box enclosure

undone all the screws for the back plate thing and it seems a bit hard to take off, just wonderin is it meant to do this? i dnt wunna like pull it and it all falls out like the guts of a fish. any1 had this problem and what i do!?

many thanks
Jackson DK2 Trans Black

Peavey 6505
Marshall 1960AV