I just received this lens today. A refurb. Looks great and seems to take photos with no issues, but I'm wondering if the locking mechanism is working properly. With the lens in the closed position, and the switch in locked position the lens turns easily to the 14mm position. As the lens turns the switch slowly slides to the unlocked position. When it hits 14mm the switch slides back to locked, there is an audible click, and the lens is locked from being turned back from 14mm to closed position. The switch functions to slide the lens back to closed position. I previously had the original 14-42 and I just don't remember it working like this. I'm pretty sure I should need to use the switch to move lens from closed position. Does this question even make sense? Please confirm lens is not working correctly, or I am just being paranoid. Thanks!