The longer cross slide with the slot in it is for use with a taper attachment. It replaces both the standard cross slide and the chip guard. The compound assemblies should be interchangeable between the two types of cross slides
Ooo, starting to make some connections now.
Here we are with the gib in place, nice tight fit.
And this would be the taper attachment:
The taper attachment is labeled "J & R TOOL and MFG CO. DES MOINES IA." I did a little bit of poking around and the only reference I could find to J&R is a lawsuit against them for patent infringement in 1967.
And then I'm guessing that this piece bolts through the chip guard slot and saddles the taper guide:
So maybe I can make my own MT2 taper tailstock attachments
I got the front gib installed on the carriage, but the two screws that hold it in place are bent, so the gib doesn't tighten up evenly. I'll have to replace those screws. The heads are also a bit chewed up, likely as a result of trying to remove them after they bent.
The rear gib is missing entirely, so I'll need to either find one or maybe have something made.
A little more cleanup on my 3-jaw shows that it's from Poland.