That is a PITA! I had one snap on me when I was trying to take off some over-torqued lug nuts with my breaker bar. The adapter was a Northern Tool brand. For whatever reason, I could not find my Proto adapter that day. I have since bought a set of 1/2" impact sockets and a better impact driver.

I can't dispute the quality of my grandfather's Proto tools or the unexpected durability of the Husky socket set I bought. I have seen some cheap trash for sockets but I have to admit that I am shocked how well built the Husky kit I got from Home Depot is. I use these sockets on my impact to take off bolts that are very highly torqued. I break adapters before the sockets budge. I think I was jumping on the 1/2" breaker bar with a Husky 17mm 3/8" socket when the adapter broke. I was completely expecting the breaker bar head to snap.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge