[Rick]

There should be a spring on the pedal? If it's missing order the spring.

There is a brass bushing that is pressed into the pedal, if its worn out, replace it. The post that is attached to the frame should be clean, if not, clean all the grime off along with the new bushing and spring some lube you should be good to go.

I found an oring that fits perfect with the shoulder of the bolt that holds the pedal on, just a little added protection to keep water and mud out of that soft bushing material.

good luck