So my bike has a rain fender/mudguard on its rear tire, as seen here, and it does absolutely nothing. I still get a nice big muddy spackled wet skunk stripe up my back any time I ride around on wet roads.

I asked my local bike shop if they had any longer ones, or ones that attack to the rear wheel's center hub (which are also usually longer), and they said the only one they carry is the one I already have.

So does anyone here have any ideas how I can DIY extend my fender around the rear tire? I'm thinking a piece of curved plastic, two holes drilled into one end, and two holes drilled into the end of my current fender, and then bolting it on with small bolts.