Hoping that at some point there might be a forum here for "Tips & Tricks" for beginners. One of the main reasons I love Keith's videos is that he takes a lot of time to show beginners "Here's how you do X".
Starting out, one of the biggest challenges for me is tapping holes in cast iron for small BA threads (7BA in this case). In wood and other metals you can repair a mis-tapped hole by drilling out and filling the mis-tapped hole with and identical wood/metal plug. Cast Iron is a little bit of a challenge because there doesn't seem to be a source that I can find for cast iron rod smaller than 1.25" in diameter. Turning stock that size down to plug 3 out of 4 mis-tapped 7BA size holes on a 10V cylinder seems to me to be an incredible waste (never mind all of the carbon dust that it produces).
I was wondering if anyone has any tips/tricks/recommendations on filling *small* cast iron holes. I've tried JB Weld, however its not strong or fine-grained enough to tap 7BA holes through it.