I have been using scope cams for a good few years now and I have tried just about every way there is to attach them to my airguns. However when shooting recently with my friend Paul I came across a new method of mounting that I had not seen before.
You will need to order the adapter rings from Ebay
1 x 52 - 52 Male to Male
1 x 52 - 38 Male to Female
and 1 x 52 - your camera's filter size Male to Female