Diana Diana Bandit PCP question

Is this gun‘s rear sight supposed to have a spring around the elevation adjustment screw? I recently purchased this and adjusting elevation yields no movement of the sight whatsoever. I’ve emailed Pyramyd about it but I thought I’d check in here as well. Thanks.

(Putting a red dot sight works somewhat, making loading a single pellet a little tricky, and you don’t necessarily need to remove the attached rear sight, but…just for laughs I also tried taking off the rear sight and put on a small, short 4x30 rifle scope and it worked splendidly as long as I didn’t mind the unnaturally long eye relief with a pistol!)