Personally I thinnk you are fixing a problem that is not a problem. This is a bicycle, low speed, low load, bottom bracket. A bit of dirt may get in, but you should be servicing the thing every year or so anyway. I have seen some pretty nasty stuff on my mtb, and have never found much dirt or water in the bottom bracket. Just saying. It may not look right to you, but I am pretty sure it is functioning as designed. I could be wrong as I cannot see it. While you are making your mud guard, you should go ahead and repack the 4 year old grease anyway.
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Originally Posted by
colorider
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.