1st off, it wouldn't work with a bmx lever, because they don't pull as much as mountain bike lever, plus if i was going to go double discs i'd need a new frame etc, which seems a waste of money atm as i just got this mint adamant and no one seems to want to swap , but it could get it working with a normal avid lever i would just extend the lever, and use the cable spliiter that i posted up earlier. because if i use double disc, it would be twice as stiff to pull as a normal brake, so i'd have to double the lever power to double the strength! see the big problem here is that i'm going to need new wheel sets and a new frame which all costs money that i haven't got atm! a magura piston is 12-13mm, if you double the diameter it will become 19mm, so this 18mm lever should work just as well as one magura lever on one brake(doubleing the lever size for 2 brakes) , of course the lever has also been extended if you look, so this should in theory work just as well as the normal magura! as the diameter is twice as big it will be pushing twice the amount of water per square inch! i've ordered the lever, so if this doesn't work then ill try double cable discs , if someone could explain better what im trying to explain then please do