Dogtrousers
Kilometre nibbler
The way I do that is to mark a V on the tyre to align with the valve, and mark a rotation arrow on the tube, so with direction and position defined on both tube and tyre I can always place them together and locate the debris. Otherwise tyres tend to slip round the rim whilst you're faffing with them, and tubes don't always go back the same way round.
I line up the maker's name with the valve when fitting. Partly for this reason, partly just for religious/superstitious reasons*.
Actually what I normally do is fit the tyre, notice that I haven't lined it up, swear a lot, get a cup of coffee, remove the tyre and fit it again.
*Yes, I even do it for tubeless, where there is no point at all