I picked up an Enco 3.5" turret toolpost on ebay recently, and am trying to adapt it to use on my 1942 199-Y 10R. It's pretty much identical to this one (), down to the dimensions of the index tabs on the underside of the post and the top of the T-nut it came with (not sure about his "A" dimension though, I haven't measured mine from compound to cutter yet). I used a mill at work to make a T-nut for the 10R's compound, but when I fitted the turret to the compound it sits up half an inch or more above center at the cutting tip!
The ebay seller was a parts reseller, so they had no idea for what the turret was originally spec'd, it just came in a box of parts from a shop. I went with it because I missed out on another auction for an Enco 3.5" turret in which that seller said came off his 1945 10L. That's what I get for assuming one is like another. Given the information at , I think the one I got is actually a 3.5" turret for a SB 13", or something similar.
I'll get some pics tomorrow morning when I get home from work. I'd be interested in a trade for the right one for my purposes if anyone has one DEFINITELY for a Heavy 10; otherwise, if anyone has a need for it for their 13", I'll gladly sell it for what I paid for it ($100+shipping).
Nick