I have a 1080, got it second hand for a good price with the low profile clamps 
The element that locks down the angle guide on the 1080 rail, is it meant to be able to be loosened to allow the guide to move yet still stay it its position? Whenever I loosen it to move the angle guide it doesn't seem to have any way to stay in place so I have to check my alignment every time.

The element that locks down the angle guide on the 1080 rail, is it meant to be able to be loosened to allow the guide to move yet still stay it its position? Whenever I loosen it to move the angle guide it doesn't seem to have any way to stay in place so I have to check my alignment every time.