hey im trying to replace my lower arm and im having trouble getting the last part off, the vertical bolt that connects it to the knuckle. its a bolt with a cotter pin and so i take off the bolt but the arm appears to be threaded to the bolt and the bolt is in a gromit and has play so there is no way i can take out the bolt from the other end, if anyone could help with this asap im trying to fix my car so i can drive it again, thanks