Northern Tool is the same as Snap-On? I threw that adapter out long ago. It was only a few bucks. I figured the cost of fuel to return it was more than a replacement. I just stick with my 50 year old mil-spec Proto adapter for the tough jobs. I think I would break my body before that thing gives up!

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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