I had forgotten I had posted this video showing the dual spindle mount. This only shows it cutting in single spindle mode with one spindle
It actually incorporates pieces of a single spindle mount I hade made previously as the clamps for holding the spindles and moving them up and down when the main clamps are loosened.
I had some issues with rigidity with this design when trying to zero both spindles to a work piece, but I have since figured out how to fix that with a simple pair of spacers and a couple bolts. It would drift back and forth about .003 to .005 as I would try and zero one spindle or the other. For a lot of my work that was no big deal, but it was horrible when trying to cut air exhaust vents in my bait molds. I had them set on 6.5" centers to cut 6" width mold plates with a .495. spacer in between and then shim to match exactly. If the plates were designed to be center injected and were symmetrical on each side of the injection port I could cut them as exact mates from start to finish both at the same time. Or I could make two left plates, and then make two right plates. I used them a few times and they worked fine for everything but the air vents. A few thousandths variance in depth doesn't make any difference to the body or tail of a rubber worm, but it makes a huge difference in the desired result with exhaust vents.
That particular mount will probably go on my wall of shame never to be used again, but I do intend to make another dual spindle mount for the Taig eventually. One that over comes some if this one's limitations and mounts directly to the Z-Axis slide rather than to the old spindle. I even have an idea for simple rough width adjustment, but would probably stick with spacers and shims for precise work piece matching to the spindles.
For those who have seen it before and are bored with my repetition or appalled by my temerity for showing off such a crude design. Sorry. I'll try not to waste your time on the next design. This was a prototype using parts at hand to test out, and it was not unsuccessful. Just not as perfect as I would have hoped.