After making a new gear out of aluminum, I decided to make an adapter to go from the 2 degree spindle to mt3. Not sure if there is better way, but I set up the taper attachment by chucking a piece of round stock. I measured off exactly one foot. Using a dial indicator I adjusted the taper attachment until I got the correct number of thousandths per foot. Worked great. The adapter was a good fit. Next I did the same thing for the taper of mt3. I put the adapter in the spindle and bored with the mt3 taper. When i was done and I put a mt3 center in it, it ran true.
Today I put a new cross slide nut in it. (Got from eBay for about $50..) Really helped to tighten things up. Now I only have about .010 slack on my crossfeed knob.
Finally I put some extra long screws on my crossfeed ribs so I could put jam nuts on them. Big improvement.