I'm pretty sure you have to drill the track for push thrus. I think they get the name from the fact that the stud is "headed" & you push the stud thru the hole in the track, install the backer & fasten w/ a nut.
I don't think the T nut style are used much on the trails anymore. I think the racers still use them because they are easier to replace/swap between heats.
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