Today’s second glitch:
I can practically correct your grammar in my sleep, so I don’t see why dim light — assuming the candlelight is dim, because it doesn’t have to be, any more than electric light has to be bright — should be any hinderance to assembling a gun. 🙂
At any rate, this example contains a comma splice. Either change the comma to a period or don’t capitalize it and add but after the comma. (Capitalizing the first word after a comma doesn’t make it the start of a new sentence.)
Candlelight is one word.
He assembled his gun by candlelight. It did not slow him down.