Gents. The casting on the double air levers I have had let go on me as I was tightening it up and one side of the thread just cracked and fell away. I can get it repaired I suppose but I would prefer a replacement. Someone has suggested opening out a 7/8 pair which is doable but has any body got any experience in this. The right size grindstone should do it. Any ideas anybody. Ta, Will.