ok, well these aren't the best pictures, but they give you an idea.

This was my first attempt, and it worked ok, but the guard up front practically obliterated the flow. (not much point then ehh?) so basically removed that guard leaving a single opening at the front, this restored it to what i would estimate to be about 80% of normal, which is good as the 3's were a little overpowered for my tank.

The front is made out of a preformed 'egg' that sells for about 2 bucks, the back is a circular disc of the same stuff. it's all zip tied together.

the front is easily detetatched for cleaning as normal, but cleaning under the guard will require removing zip ties.