36
Chances are that the outside of the quill has rusted and attached itself to the tailstock.
1 Take the grub screw out of the wheel so it comes off (normally a push fit weld by a grub screw onto a flat)
2 Remove the lock screw (normally on the back of the tailstock, if it isn't obvious can we get a picture of that side please)
3 Try to unscrew the drive screw from the back end (should come out once the wheel is off)
4 Use penetrating oil and a mostly safe drift to get the quill out. A rocking motion of 2 taps from the back and one from the front should get you there
5 Clean everything and re-assemble.
Some grease on the thread portion is OK, between the quill and the tailstock I prefer to use machine wax as it doesn't collect sawdust.
Look forward to your progress report