I kegged my newest beer, yesterday, and the needle wouldn't move as I adjusted the screw. I pulled the screw all the way out and released pressure, but it was still reading around 25 psi. After much fidgiting, I gave a good flick with my finger, and it dropped to zero. From there, I adjusted it up to 15, then put CO2 on my beer. This morning, it was reading around 25 again. I flicked it, and it went back to 15. Can the needles be greased or adjusted?