Follow Zippy's advice, but take the second approach. One of my Grandes came with a butchered subframe. One of the back wheel mounts had torn through, and the pedal hole was torn. It had clearly been used as a dirt bike (there was all kinds of dirt built up in the centerstand and in the cylinder head fins). I welded washers in both places and it works perfectly. I can put as much pressure on the pedals as I need, and there are no problems.