Sphere Jig Accessory Question

[David Delo]

Anyone know of a vendor that carries what might be called an arbor extension like shown
in the following video clip. Brian Mills shows something beginning at the 1:47 mark of his
video. Can't really see what's at the end of the shaft very well, if it's flat, 2-prong,
4-prong etc. Looks like this type of arrangement could save on material and provide added
space for swinging a sphere jig. Looks stout enough to handle anything. Might be home brew
but wanted to see if anyone had a lead on a vendor. I do have a MT2 to MT2 extension but
was looking for something a little longer.

https://www.youtube.com/watch?v=2uh5CcsAIQg

(https://www.youtube.com/watch?v=2uh5CcsAIQg)

[Don Bunce]

It looks like a MT2 extension with a spur drive. At the end of the video it gives an email address to contact him. Might be worth checking to find out what it is.

[David Delo]

I did email him and he replied that he did make them himself, so not a store bought item. Probably easier to get a local machinist to make them but he's going to quote a price for me.