"Ah."

Unfortunately, there is indeed too many little pieces for Optimus to tell offhand whether or not something's added to them- he can, at least, carefully reach for the (comparatively) tiny tool. Gingerly picking it up between thumb and forefinger, he manages to get it over to Mikaela without (as far as he can tell) damaging it.

"Ratchet always preferred his own devices."

While Mikaela certainly took to his lessons with ease, there's something to be said about the capabilities of different species...