I have an '85 with the single TPS (TBS).  The thick walled Allen head
screw is to loosen the plate and the smaller (thin walled) is for making
the adjustment.  Well, my adjustment screw didn't strip out ... it's
wall broke away ... crumbling due to age and corrosion I guess.

Is this screw easily replaceable or do I have to remove the TPS from the
throttle body first?

Thanks,

Mike