4-40 taps

The hole is taped all the way thru so a 4-40 set screw Locks the top button head screw with a Belleville washer under it,
To keep downward pressure on a rotating aluminum top. I’ve made these before after grinding the tap shank to clear the threads but that tap is wore out. I have a taping fixture or a tapmatic 1a I’m hoping to use.
This is California if you want to see a design pm me.
Thanks for the help, advice, thoughts
 
Thread forming and x-press are the same thing,that is what they were design for soft material,Besly design that tap when I worked there

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Not familiar with those taps , hopefully the ones I ordered will work ok.
 
I see that x-press tap is a company product name. Another piece of info to file away for future use.
 
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