I am having an issue with the turret. It is not clamping at 2 tool stations. The turret was taken off as the machine crashed. The turret was taken off and replaced and the tool stations that did not clamp changed (it started with problems at 9 and 10 then moved to 3 and 4). I read one post that the O-ring on the mounting place caused this problem but the surface has been cleaned thoroughly. Does anyone know any mechanical issues that would cause that?