I ordered these pedals and nuts that would allow me to use the pedals with the crank shortener I made, but I think the nuts don't fit. I just tried putting them on my hand and I couldn't screw even half of each nut on. The description of each pedal says "The thread of the pedal is 9/16" - check your bike or trike for compatibility/fit." What do you think? Do they make a nut for this? What exactly is the thread specification for 9/16" pedals?