I have a turn-nado 17" lathe that for years I've been machining tapers and all of a sudden on smaller shafts I started to get a spiral cut at the end of the taper. It did not seem like chatter and I noticed that the taper attachment seem to bind a bit the closer it got up the taper toward the chuck so I loosened the 3 set screws on the gib on the slide block. That took the spiral cuts out but it caused the taper to be longer in length. I took a known good taper on a large shaft that is 6.5" long set it up in the chuck placed a dial indicator on centerline of the taper, engaged the taper and manually ran the saddle up the taper to reset the angle of the taper attachment. I got to a point where I get 0 on the indicator for 4.5" and then the indicator says the cross slide was moving away from the part which explained the spiral cuts I was getting. So any ideas as to what is wrong or warn out?