Millrite knee crank - adaptation from BP?

[AR1911]

My Millrite came with no knee crank. I've been using a crescent wrench to move it up and down.

Not finding a used one after months of looking, I ordered a new crank and handle from Grizzly, which appears to be a BP clone. It's a nice chromed thing, with spinner handle.
Now I need to get the approx .500" round bore to a 5/8" square bore to fit the knee.
I'm wondering what bore the Bridgeport uses, and if I ought to buy the short adapter that the crank "teeth" engage?

Either way, I need to turn a round bore into a square one.
For tools, I have everything but a shaper and "one of those things that drills square and hex holes whose name escapes me".
I have lathes in various sizes, and the Millrite and a minimill.
I have a nice broach set, but I can't figure out a way to use that for this purpose.

I expect I'll end up setting up a shaping setup on mill or lathe and cut it that way.
If not, I'm down to a square file.

Thoughts, suggestions, alternatives welcome

 

[pjf134]

How about making a adapter, sq. to round. Better then a file I think.
Paul

 

[AR1911]

That was my plan. But then someone said Reid had round stock with square bores. Sure enough, they had something that looked about ideal, so I ordered one.
It's 1" OD, 5/8" square bore.
4" long approx.
One end is threaded 3/4" NC.
That gets me most of the way there.

 

[pjf134]

You could also measure corner to corner of square and bore round bar to that dim. and add a couple of set screws on flats, then machine other end to 5/8" O.D. That way you just use round stock.
Paul

 

[AR1911]

That would work, but it would booger up the shaft.
Most people don't leave these in place, so they come on and off frequently.