Any advice for a stuck Quill?

Good that you got it fixed. I have been using up to 100 mm forsner bits on my lathe and my quill was sticking. I removed the hand wheel compleatly removed the quill

Gleaned and greased refitted good as new.

Just as a tip a have a thin bottle brush that i clean the centre of both head and tail stock. Its small enough to pass through the quill. removed the gunk lol