Quote:
Originally Posted by sheepherder
What short memories you people have... 
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I bought the proper tap about four years ago, at around the time this was discussed back then. It wasn't too hard to find. I'm sure they're still available somewhere, but as Rich suggests, I can't remember the source of mine. Same fate for the info of which Whitworth size and thread it is, as well. John S's blueprints reveal it, I'm sure.