All you have to worry about Speedy is that if you have to take the tool off the cut, always wind back at least one full turn, preferably two, before going back to your previous setting.
If you don't, then the backlash in your leadscrew (and we've all got some) will bite you on your bum.
If possible, whilst doing a job, only turn forwards (or backwards, depending on the job), then you know the backlash won't be causing you problems, and this goes for ALL standard leadscrews on ALL machines you have.
A notebook and pencil by the machine saves having to have resettable dials.
John