threading the rod back into the hinge, ensure the following list of parts are threaded onto the rod in order

P31 (end already welded on), P33, a washer, P31, P11 , a washer, Cylinder base, a washer, P11, P31, a washer P33, P31 (end already welded on)

This is a temporary arrangement to get the hinge in place and centred. Later we will remove the cylinder, P11 parts, and the 2 washers between them.