I suggest NOT to spin the volume fast. You'll wear out the volume control, and what will end up happening is the volume will sort of "skip" while turning and not move up or down. I believe the pot is a bit fragile. Having installed and use many, you can tell which are older and which are new, or haven't been used as much by the feel of the volume control. Brand new, the volume basically feels the same as the tuning knob.

I replaced mine a bit ago since it was a pain to control volume. I use much more finesse while controlling the volume now.