So, I feel like a bit of a fool that I didn't check this until today. After I built up the rear wheel for my bike, I realized the hub spacing is 120mm OLD, while the frame spacing is 126mm. It fits in there, but I have to flex the stays in just a little bit.

I've heard many times that it's OK to flex the stays to fit a 126mm hub into a frame with 120mm spacing. Is it safe to go in the opposite direction? If not, I just wasted a lot of time.