I got two loo roll inner tubes, blackened the insides and glued them together, side by side and collimated them..
I was amazed: I reckon I got transmisson of 103.756%.
Translation for US visitors: Loo = toilet/washroom/rest room.
LOL. To get such a high errm, throughput, you must have used Andrex tubes which are the alphas of loo rolls. Other brands are available.
Lee