Thanks both,yes I realise the plungers are adjustable,the N/side one,that that is the problem,is adjusted a lot longer than the O/side,this one locks.The previos owner had a new condensor fitted not long ago and the cable I think is in need of adjustment.Problem is I cannot even find the perishing cable,let alone adjust it,I can feel the end beneath the latch,but cannot get to it. I will have another go to-morrow.