Sometimes you use what is available when turning long cylinders.
I needed to bore to size then thread the inside of a length of 1" stainless tubing, but it extended over 3 feet beyond the back end of the lathe spindle even with a centering bushing back there the tube was going to whip and could have bent So I pressed a flanged bearing into the remains of a spherical bearing then clamped it to my arbor press. The alignment was spot on center of the spindle bore.
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Attachment 41439
Taped to 7/8-20 tpi
Attachment 41440