I purchased this POSP scope from Military Gun Supply. I am trying to mount it but I can not get it to tighten up. I looked at others on E-bay and see they have a slightly different mounting bracket. The directions say there should be a nut to adjust the tension but this one doesn't have that. The one on e-bay also has the nut and the adjustment handle on top.
http://www.militarygunsupply.com/shop/item...itemid=SCRU0004
Has anyone used this mount before? How did you get it to tighten up?