Can you solve these physics riddles? ft Simone Giertz - Part 1/3

I was a bike mechanic for 5 years throughout high school and a year after, so that bike question was TOO EASY for me!! ;D haha, but I have an idea of why the left pedal is left hand screwed (although I am not certain, so take this with a grain of salt)...

So when you pedal, the pedals are going the way they get tightened (i.e. the right pedal is going clockwise and the left pedal is counterclockwise.) but technically if you look at it, the threads of the pedals are going the opposite way. So basically when you are normally pedaling, assuming the pedals have no spindles, they should unscrew. So in all technicality, I am pretty sure it does not matter what way the threads go on a pedal, because the spindle makes it negligible (ever pedal backwards on a bike? The pedals remain in! Boom, point proven! Haha) so I have a different theory.

The reason the left pedal is reverse threaded is for production! As a bike builder, I found it to be MUCH faster to screw on a reverse threaded left pedal than a right hand thread pedal. All I had to do was put my pedal wrench on it and twist the crank! Where as if it was right hand thread it would go much slower because it would have to turn the whole wheel assembly. Plus I always worked with the right side of the bike facing me, and having a fast, freely spinning wheel right next to my face is sort of scary when I want to tighten a pedal. 

So I hope I nailed this, but otherwise, I am excited to see what the real answer is!!