On Mon, 4 Dec 2017 11:28:22 -0800 (PST), "
wrote:

On Monday, December 4, 2017 at 7:18:13 AM UTC-5, Jim Wilkins wrote:
if it's an AA/Sears 109-21270 your next problem will be spindle
deflection.
http://www.lathes.co.uk/craftsman/page5.html

If it is an AA Sears lathe , the first problem was spindle deflection.

Dan

And the second problem was spindle bending, right at the bottom of the
nose-thread relief.

--
Ed Huntress