Use the brake bridge to support the fender. Make or find a little L-bracket, bolt one side to the fender (you may have to dremel the protruding bit underneath) and hang the other off the brake bolt.
Bodge version: melt a hole in your guard and attach using 2 cable ties.
@Drano started
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Use the brake bridge to support the fender. Make or find a little L-bracket, bolt one side to the fender (you may have to dremel the protruding bit underneath) and hang the other off the brake bolt.