There is a halacha that if one is unsure if certain letters of STa"M (Sefer Torah/Tefillin/Mezuza) are of the right length, one can ask a child.
What happens if there was a doubt in a letter in a tefillin, one sofer asked a child, the child misread it, and then afterwards someone else showed it (not knowing that it was already shown) to another child and the second child read it correctly?
- Can the second man fulfill his obligation with this Tefillin?
- Is it a Safek (so if any of the two sofrim put on tfillin with these Parshios, they would have to put on another pair without a blessing)?
- If this happened a few times (this ksav was shown to a few children), and all read it wrong except for one, could that one later on (assuming this parsha was unfixed) claim "leshitaso" and wear this tefillin without a Bracha?