And what has the "A" license system ever done for me ? stopped me pouring bl***y oil after some 25 + years what progress ! incidentally the fact that all the cans are bounced all around the airfield in the vans must at least slightly mix the contents ?(cant comment on hangar chaps though) you cant beat a sturdy can opener and two holes 180 apart, using the GS too bl***y painful ,as you will be only too aware if you have ever oiled the venerable JT9