cgallant wrote:oil wont do much for you. Your better off with a high temp grease like Molybdenum disulfide grease. I use that on my RS250 valve shaft needle bearings with no issues.

Go with Charles's recommendation here and use moly grease. That's how I put together all my RC valves.

Grinding in the recess (not the valve) will be ok IF that is the problem. See where it's binding by using a marker pen on the valve and rotating it within the recess, you should then see the witness marks where it needs a tickle.