okay Lloyd, i was just being stupid. i was trying to mount the footpeg on the other end of the lower engine mount stud, like the left side does (a la the K models). i had previously tried putting it on the correct post for a minute, but it seemed too high, and it interfered with what i thought was the F kickstart arm. well, i guess it wasn't.
one problem solved, but dammit, now i have to find a proper F arm. my local used parts place can't seem to locate anything unless you have another to bring in for comparison (why would i be looking to buy one from them if i already had one???).