Quote:
Originally Posted by Brian
What you're doing wrong is using the wrong plugs...5/8 UNF has 18 threads per inch, 3/8 National pipe thread has 18 TPI too. So, I'm assuming that the tap you are using is 5/8 UNF and your plugs are indeed pipe thread.
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I believe Brian is right. Those holes in the head should be 3/8” pipe thread