Car on stands and finishing front end rebuild. Manual says when installing shock"spring will have to be compressed slightly using small jack to achieve correct shock absorber fitting position."...what do they mean by slightly?...also""tighten the top nut till it just nips the plain washer and metal sleeve and lock with locknut".....I've done this but the shock seems loose and moves around at the top ofthe tower. Shouldnt it be solid? What am I missing? Karl