I have a bike I'm returning and disassembling; I have removed one pedal, but the other won't budge. I've been trying with an Allen wrench from the back side of the pedal per the instructions in the assembly manual, but my wrench is too wide to fit between the pedal and the crank. I'm trying not to make any marks on the bike, but I have tried hitting the Allen wrench with a dead blow hammer and even putting a section of pipe over it for additional leverage, but it doesn't move. Any suggestions?