Chainsaw Repair

No tee handle ball ends  but one of my metric ball end long shank sets at work is Bondhus .They hold up and are as strong as any .I literally wear them out in a couple of years especially the 5 MM because many things in the automotive industry uses M 6 socket head fasteners .Trying to unscrew something at an angle using the ball end with a cheater handle on the short end you just eventually round off the ball end until they just can't  gain purchase on the fastener .