Penn State turning between centers live center

[Monty]

All of a sudden, I am having the spanner nut that holds the bearing in the live center work loose. I've tightened it down as tight as I can, but it'll come loose again before I finish turning one blank any suggestions on keeping it tight?
Don't want to put Loctite on it in case I do need to replace the bearing.

 

[jocat54]

Use the blue loctite-- it will hold but still able to remove.

 

[Monty]

Blue is what I use on everything. Just not sure I would be able to take the nut off using blue.

 

[gimpy]

Blue is what I use on everything. Just not sure I would be able to take the nut off using blue.

You'll have no problem getting it loose