type 44 door front adjustment

[DeWitt Harrison]

Front passenger door seems to be sagging on it's hinges a bit. The door
latch catch bolt is adjusted properly because everything looks true when
the door is shut. Clearly looks low at the trailing edge when almost shut,
but it takes a firm slam to latch. Or better, a lift and shut.

So how to adjust? There is one big ass bolt from each hinge into the door.
I suppose there must be a bit of slop to play with there when the bolts are
loosened. Any way to get into trouble?

Thanks,
DeWitt