Quick Turn 15 Tailstock body slips. Help!

Hi Everyone,

I'm finally getting around to using the tailstock on the qt 15 and the tailstock body gets pushed back when I engage the quill against the work. This happens even with the tailstock quill pressure adjusted SUPER low. How do I fix this?

Also, there's a switch inside the electrical cabinet door next to the chuck ID OD clamp switch that says tailstock " clamp" and "unclamp". Right now it's in "clamp". How shall that switch be positioned and for what???

Thanks very much guys,

Grant