I have 3030 bogen tripods for my camera. Since the tripods don't have a sprit level on itself, I'm having a little bit hard time to set composition when shooting. Then, I've heard there is a leveller that fits between center column and head of tripods from bogen. I've been looking for the product, but I could never find it. Does anybody know about this leveller or something similler which could fit to my tripods? Any input will be greatly appreciated. ric YAMA