[fastfredracing]

Snap on sockets/wrenches, are hands down best fit on any bolt head. Look carefully, to see if you have cracked the socket . Maybe a hair line crack right at the very top of the tool. That is about the only time I have problems or, I have had to replace a few that just plain wore out from years of use .
When snap on's "flank drive" first came out. I was hesitant to replace thousands of dollars worth of wrenches and sockets just to get the newest gimmick.
I had a 12 mm bolt on a Honda, that was totally rounded, and I was fighting it when the snap on man came in . I tried every socket and wrench I owned, and had that bolt totally rounded off .
I told him, that if "flank drive " removes this bolt, I will replace all of my tools with it right now. I ate my words that day, and went right back on the easy payment plan.