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Who ever came up with the name speed nut they are the pain in rear. Especially the ones on the tail lights on the mid years. I was about ready to glue the lights in.
They were probably quite handy when installed under force with a powered tool of some sort. But if installing them with a manual wrench, on a new stud necessitating the cutting of threads, well they sucko mucho.
If you're installing them back where they came off of, it usually helps to turn it backwards just enough to where you can feel it catch the old thread it came off of, then, turn it clockwise to put it back into the same thread it was removed from. (Make sense??)
If they're going on a new stud that has never had threads cut into it, it usually helps to apply a little pressure on the nut to help it engage the stud.
If it slips or doesn't catch, refer to the above post suggesting you tap it to close up the opening slightly in the speed nut.
I use handle type socket wrenches. The ones with the plastic handles and the socket at the end. Also, it helps to put the speed nuts onto the part before putting the part onto the car.
If the nuts are going onto new/repro parts to cut threads (e.g. side spears of fender windsplits) I spray WD40 onto the studs on the new part and carefully screw the nut ALL the way down very carefully and very straight BEFORE installation. Its too easy to break those cheesy studs off if you are trying to thread them with speed nuts while laying upside down under a dashboard...