Same for me. I think the answer is a proper metal length adjuster like you get on something like a Nicky Clarke hair trimmer, only with a lever that clicks into set positions rather than analogue controlyour keyboard is going to be full of even more grot by the looks of things![]()
These adjustable length things don't really work very well in my experience either. they would work perfectly fine if your hair stuck out at a tangent to your face but it doesn't in most instances. It comes out generally all facing down on your cheeks until it gets to a point under your chin and sort of "flattens out". Because of this most length adjusters don't pick up the hair properly for the cutting blades and they just seem to miss so much of it and you have this slightly patchy shave.
In the end i just use the long hair trimmer on its own, without any adjustable length thing on it. If anybody has a model where they find this isn't the case then let me know
B@
http://di1-2.shoppingshadow.com/images/pi/6a/50/5e/37053296-260x260-0-0_Nicky+Clarke+NCM29.jpg
All the ones with adjustable plastic guards that I've tried have been pretty poor (Babyliss, Remington, Philishave)