hi people,new to this old cycle stuff but luvin it:need teck help just put a new wheels in my sun gt racer, (oldsize drop outs)fitted og cassete to new wheel, spread reer drop outs to fit wheel,but derailler will not move fully up,no more movement,can i space the cassete out? or reduce the small spacer between cone and lock nut? have adjusted h&l screws no joy,any help be great tar..