Door latch is squeaking
 

My driver's side door has started to squeak / creak recently. I believe it's coming from the door latch. Over rough pavement (in Boston everything is rough pavement) the jarring causes the door to move slightly across the latch I'm assuming.

Does anyone know how to dial-in/tighten this latch to avoid this annoyance?

thanks,
:(

Just for the record I found a thread over at Renntech that suggested using a stick lubricant. Applied it last night to the strike plate and latch and it cured 95% of my problem....cost $1.99...