I know guards aren't everyone's cup of tea, but my mate has one of the fender benders and it's pretty good and discrete too, so I've ordered one and a 'butt fender'. Why not for £4 and £3.75 respectively.....
http://www.muckynutz.com/index.php?rout ... ry&path=49
http://www.muckynutz.com/index.php?rout ... ry&path=49