Which direction do you spin the trailer brake adjuster?

Going to try and talk my friend into letting me adjust the trailer brakes. Ideally i would inspect and grease the bearings but there is noway thats gonna happen before they go on a trip. I was the last one to tow the trailer and the brakes seemed weak. Full manual control wasnt doing much. I have a clamp meter and have read i want to see about 3a to each wheel. Which i will check later. Im pretty sure due to age the brakes need adjustment regardless.

If im allowed, im just gonna jack each tire up and spin the adjustment until i hear scrapes, then back it off. Is that correct?

Im worried the first wheel i do i might spin the wrong direction. Causing the brakes to be so loose that a component falls off. (no idea if thats possible or not) I would just pull the drum off but thats potential for the whole "why you messing with my stuff".

Been watching videos but havnt come across one that shows the direction that tightens up the slack.

If doing the driver side tires do i spin the little sucker upwards or downwards? Is the passenger side opposite?

Thanks for any advice. I know we should grease bearings but this conversation comes up with all types of things. She thinks "if it aint broke dont touch it". While ive always been a fan of regular preventative maintenance.