I've had my 46-460 for just over a year, but really just started using it last spring. My first lathe, so when I started drilling on it a few months ago--I assumed the first 1/8" or so being loose was normal. (I just cut the blanks a little longer and trimmed that end to make up for it). About 2 or 3 weeks ago, the speed controller began to malfunction by slowing down and speeding up. Though under warranty, I didn't want to be without a lathe during the repair so I picked up a Rikon 70-200--world of difference in the tailstock. There is not more than .002 difference between entry and exit hole diameters (without tightening the quill lock at all).
Until I get a few more Christmas pens done, i'm going to leave the Delta set up as a buffing station, then take it in for the warranty work. Can't use it to apply finish as the speed drops to an absolute crawl randomly, but I can live with speed variation in buffing and it saves the swapping.
In my mind, both lathes have advantages over each other--would love to merge them together!! i.e.:
Quill Travel--Rikon has a little over 3" compared to 2" on the Delta, so I can do a single barrel pen without repositioning the tailstock.
Tailstock Taper depth--my drill chuck is big, so I lose 1/2" of travel on the Delta because it hits the auto-eject. Rikon I lose only about 1/16" so my usable travel doubled. (yeah, I could have bought a smaller chuck...)
Belt Changes--Delta's lever is a dream compared to the Rikon system. I miss that, as I use all 3 ranges on almost every pen (center for drilling, hi-speed for turning, low for finishing)
Switch/speed control Mounting--prefer the location of Delta's since my tools are normally in my right hand
I'm glad you brought this up--I may see if they will swap out my tailstock when I take it in for work.
earl