It sounds like what I had on mine. It is only a 90 degree anti-clockwise for it to be removable but I think that it will also work the other way as well if the scope is not mounted but because the lever unlocks on the left side and the other part of the dovetail is on the right it goes anti-clockwise when scope is mounted. I do have to agree with you that it is almost impossible to move when off the rifle. The lever release is called a "H7" model but before you mount it check the offset of the front ring as there is about 3 or 4 which depends what scope your using as this offset is to adjust the eye relief.

Cheers,

Jeff Gray