The right hand lead screw support was babbited in final assembly.
As you know, when you have a stack up of tolerances, something has to be fitted, adjusted or customized.
At finial assembly, the saddle was scraped in to the bed then the apron was installed.
They had a "dummy" lead screw that was put into the apron, and the half nuts were closed.
It was then moved into the right support that was already mounted, and babbit was pored in.
The dummy was removed and the hole was reamed and the babbit was drilled out of the oil hole.
In addition to that customizing, the gearbox was "fit" too.
A fixture was mounted to the bed where the gearbox goes and an alinement bar was put in.
the fixture had adjustable center lines that alowed them to line up the bar with the worm in the apron.
When the bar was in the right place, they would take off the fixture and put it on a special milling machine
to be used as a target to set the cutters for milling the top of the gearbox that was to be mounted to that lathe.
After milling, the holes were drilled and tapped.
The lead screw was now installed in the gearbox and then it was mounted to the lathe.
Everything in perfect alinement.
Parts from one machine installed on another will be very "close", but not perfect.
Ted Pflugner
>>>>>

The collar on all early 9 Jr. and tool room lathes as well as all 8 Jr. and 9 inch tool makers lathe
as well as the workshop 405 415 C and B model lathes is secured with a taper pin. Its on some of
the lathes they hit the collar with the hammer when they were installing the taper pin and so was
setup and turned to have a clean finish on the Collar. In doing so its almost impossible to find the
taper pin as it fits so close to the collar. I have used cold gun blue to find the pin head. The metal
in the pin is different than the collar so will be a different color. This is the only way I have found the pin some times.

Dennis Turk