I got a new set of pedals and can't wait to ride with them. Problem is, one of my old pedals is seized on. It's a stainless thread on an aluminum crank arm. The spindle is round with no flat area for a pedal wrench, just a 6mm allen bolt. I've tried everything I know - WD-40, heat, wailing on it - and took it to a local mechanic who bent three allen wrenches before throwing me out.