well its as i thought, the starter motor has two copper plates connected to two copper studs - which the +ve and -ve feeds are joined onto. When trying to remove the nut off the +ve stud, so that I could upgrade the wiring I managed to shear the stud off the copper plate. unless it can be welded(brazed) back on - i think its a new starter for me.
theres a specialist starter motor place nearby, so i will drop round there later and see how much they charge me, grrr