Testing out my new quill lock then the quill jammed

Two hours finding the problem. Thought I'd got cast iron dust in the guide when I drilled the holes for the pneumatics. Hadn't. Though the clamp was binding. Wasn't. Thought I'd deformed the quill with excessive locking force. Didn't. Thought it had to be gunge, fetched the quill out and got it clean enough to eat off. Did no good.

If your Warco quill seizes up for no apparent reason and defies all efforts to free it I have the solution. 2 minute job, miracle cure, no disassembly required, will cost you a bottle of Hobgoblin posted to Sussex :naughty:
Quill now tracks up and down easy peasy, the Z depth on the computer screen agrees with the linear scale on the mill +-0.01mm moving in either direction. However, cutting forces can put them up to .05mm out. Hence pneumatic quill lock.

Yes, I know 0.05 is only 2 thou