Hi,I recently posted regarding our disco 2 td5 commercial having trouble starting or rather not starting.thought it was immobilzer but after following a few steps which we were guided to try out we found the starter motor selonoid has gone.we have bought another starter motor and have tried to replace. Undone the bottom two bolts but really struggling with the top bolt. Consulted the Haynes manual which just says undo the bolts and remove.i know I suffer from fibromyalgia but 3 hrs trying to remove the top bolt is ridiculous. Can get my finger tips on it but can't get a socket or even a spanner on it.this is done from underneath as unable to get to it from above.any any ideas or tips would be greatly received as then hopefully after many week's I'll have a working truck. Thanks you