Having an issue with a new Z5. Scope operated fine out of the box. Decided to put new rings on and remount it. After bore sighting last night, I wanted to make a couple adjustments, and for some reason the elevation turret is completely stuck, as in it won't turn either way. This is both with the elevation rings and cap on and with them off (using the tool to make adjustments to zero). Any one have any idea what's going on?