Bob
Nice project and great write up as usual.
I made a stand alone tapping guide years ago. I must say your casting looks better than mine.
I picked up a set of long tap wrenches at Grizzly. http://www.grizzly.com/products/Extra-Long-Tap-Handle-Set/H2721
The current price is about the same but mine was a set of 3. I used the smallest one in my tapping arm. Even it would be too big for a design like yours but it works great in a bigger arm.
No snow in Calgary yet.
Cheers
John
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