I can't help much, but I did find this page that might be of some help. Don't know if your lathe looks like any of these, but the pics might be helpful. Good luck! ![Smile](images/smilies/smile.png)
Page Title
Engaging backgear on the Model 101 Atlas 6" lathe. At first sight there is no obvious way of releasing the large V pulley from its embrace with the spindle. The secret is the "external locking ring" on the end of the pulley; this is simply pulled outwards to uncouple it from the shaft and the backgear lever then operated as usual to mesh the respective gears.
<a href="http://www.cnczone.com/forums/mini-lathe/82871-7-x-10-project-started.html" target="_blank">7X10 Lathe conversion</a>
<a href="http://www.cnczone.com/forums/open-source-cnc-machine-designs/335846-cnc.html" target="_blank">Custom X-Carve router</a>
<a href="http://www.linkedin.com/in/tooldesign" target="_blank">LinkedIn</a>