It s the roof to windscreen that s the issue water getting in.
Mx5 roof latch adjustment.
First lower your top and undo three 3 phillips head screws to remove the latch.
Notice the adjustment screw is secured in place with a locking clip see pic to keep the adjustment screw from readjusting.
Pry off the e clip from the lock pivot pin.
By adam kendl pepsiaddict i use terms adjustment screw and locking clip not sure what the official terms are.
Miata convertible top latch adjustment duration.
Locate the hexagonal adjustment screw see pic on the desired latch.
If you use a 3 large screwdriver the screws should come out easily without marring.
Mazda mx5 eunos miata roadster broken roof latch locking button solved fixed duration.