If you need to move the easylink end from one hole to the other position (There are 3 positions) , you do need take out a springbar holding that end. That's why you need the tool.
Akilles
I know you're trying to help srhoque but I think it's getting rather confusing.
Basically Akilles.
The easy link is a 5mm adjustment, you can activate without a tool at any time on the datejust 41 and a few other models. It's not great... because its set at 5mm and can only extend 5mm. But it's better than nothing. So.. my personal advice is set the bracelet for when you are cold... because when you are hot/higher salt intake possibly you'll be able to use the full 5mm.
However, what srhoque is also saying is there is ALSO a second adjustment that you can make which is 3 holes, roughly 1mm apart that gives you further adjustment of the bracelet. But this is not something you would wish to do whilst on the move as you require a tool, spring bar tool preferably, at the least to perform this. So there is micro-adjust but that is not for whilst you're wearing it, that's more for sizing the bracelet in the first place.
Hope that is clear