Here are his notes he sent with pics:

This is the keyway plug for your hub. I machined it on the end of a 1-1/2" aluminum round bar, just to have a way to hold it since it has 1.38 degree taper (2.75 degree including angle), then sawed the plug off. Here, I have faced it in the lathe to true it up.

The broach is tapered so the chips get progressively larger as it is pushed through.

Here's the hub with the key you supplied, This is a 1" long key, the standard number for it is 808.

You might need a 806 key and to guide you, woodruff key numbers decode like this:

(8#) 1/32's thick
(6#) 1/8th thick or 1/4" x 3/4" long

The hub is 3/4" wide internally. Depends on how much room is on each side once re-installed. I will include another woodruff key just in case the shaft is damaged some and needs deeper engagement. This key will be 1/32 of an inch taller.

Anyways, it is ready to rock and roll.