I recently got this off 3b4y for £14.99, it looks a just like the one here: http://www.airgunbuyer.com/details.a...s&Product=7653

The trouble is the aiming reticles look horribly blobby and out of focus. I've found a little grub screw which I can completely take out with the smaller of the 2 alan keys provided.

I was wondering if this is meant to be used to bring the reticle into sharper focus? So far can't say I've noticed any improvement whilst twiddling this grub screw in or out of the scope.

Any help greatly appreciated.