6" Atlas

As I now recall, somewhere in the pile of stuff the P. O. gave me is a little toggle topped stopper (kind of like a miniature thermos bottle cork) that he used to keep the coupling engaged - almost as good as fixing the problem

mine kept disenguaging...there was too much space between the pully and the spindle pre-load nut...the pulley would drift toward the headstock enough to cause the coupling to kick out...I took off the spindle nut and put in a home-made spacer to take up the slack...works perfectly now

Looks just like my first lathe. I didn't have this problem though. O sold mine because someone welded the drive gear on the leadscrew if I remember correctly. This wouldn't allow me to change threading gears, plus I sort of out grew it anyway.

I was sure to inform the buyer, who only wanted it for polishing shafts and small parts. I wouldn't have bought it if I had been told the truth.