Richard,
Well spotted on the S/A pivot pin ! The bike was loosely assembled by previous owner to enable a bit of "rolling".
Is it possible that at some point in this bikes life it underwent a rear brake conversion from full width rear brake to half width rear brake?.
If so, based on your comments, it would appear that they missed the mark with the pedal installation.
Attached is a pic of the frame as she is now (with a solid S/A pin, new silent blocs, new rear shocks )
Funny thing is, since snowbeard started this thread, I went to check the frame thats been in my shop for a while and ...errr... ahem.. the hole for the rear brake pedal has gone
. I can only think that the shop that straightened/powdercoated the frame filled it in by mistake and I've only noticed it 6 months later
So like snowbeard, I am possibly looking at some sort of rear brake mods and I like the idea of continuing with the side brake rather than having to get a full width hub, new hollow s/a pin, crossover shaft etc.
Your pics/info on your boss installation would be great to see.
Cheers
Scotty