Hi Phis
A new MT3 to MT2 cost $10.27
The taper shank removal wedge is sold by Mcmaster-carr.
the order no. is 2796A13 and the price $8.85
http://www.mcmaster.com/

Have fun and take care
Leo Van Der Loo

Phisherman wrote:

I have a 2-3 Morse taper adapter stuck onto a #2 Jacobs chuck taper.
I tried tapping a Morse taper wedge into the side slot.
snip

That's a good point. I can see the tang end of the taper inside the
slot, ever so slightly. When the wedge is inserted it doesn't touch
the taper end, so I slightly ground the edge of the wedge to chamfer
it, which that did not work. I was hoping to find another wedge type
to buy.