Started to give the bus a bit of a service, changed the oil, checked the plugs as they haven't done too many miles, first 3 were fine just broke the grip with a socket then unscrewed with fingers, nice colour so soft wire brush and back in but cylinder 3 was sticky coming out and wont go back in, 1.5 turns then it locks :evil: . I don't remember having a problem fitting the plug last either but I've got a spark plug thread chaser on it's way has anyone any tips for using it, I know I need to grease it to catch any swarf and to go gently but is there anything else I should be aware of :roll: Cheers.