5/8 Straight Boring Head Shanks (7/8-20)

If you don't feel confident enough to create one, Victor Machinery on line sells 1/2", 3/4" and 1" arbors in 7/8" X 20 tpi for $16 ea.
 
I read that a 3/4" shank would be too large for your machine. Would a 1/2" straight shank work?
http://littlemachineshop.com/products/product_view.php?ProductID=4824&category=
If you don't feel confident enough to create one, Victor Machinery on line sells 1/2", 3/4" and 1" arbors in 7/8" X 20 tpi for $16 ea.
Not sure if you have anything reads on threading.
There are many good ones available.
Here is one.
http://neme-s.org/Shaper Books/Tapers and tThreading.pdf

Daryl
MN

I bought the 3/4" shank, and I think I'll turn it down. I'm pretty excited, honestly.
 
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