I've only recently begun trying my hand at small watchmaking tasks, and next I would like to regulate my vintage LeCoultre Automatic HPG Master Mariner that has been running about 16 seconds slow per day. I've tried to read guides online, but they always mention two plates - a "regulator" and a "stud". However, my watch only has one plate with a screw (both labelled in my photo). Both of these have + and - indicators. Could anyone advise me on which to manipulate?