Something has been bothering me about regulating a mechanical watch, -
On one hand when someone posts about their watch running 5 minutes fast a day everybody says it's too much and something's wrong with the movement (magnetized or stuck spring).
On another hand when reading about regulating they say even a tiniest adjustment to the regulator bar/screw will result in a huge difference. For example, regulating a +/- 15 seconds/day watch may prove to be a time consuming task, it being very easy to overshoot by 30 seconds or more...
So, which is it - wouldn't one just move the regulator quite a bit further to compensate for a big difference? It seems that the total span of the regulator bar could be way over the "something is wrong" 5 minutes range?
Of course, I'm not talking about a watch that's been running +5 seconds/day and then suddenly overnight it went to -5 minutes. Something probably did happen there and may require professional attention... Even then, unless it's an expensive piece I would think that regulating it should be a problem
Am I missing something obvious here?