I'd suggest using a 45 degree "street ell" threaded into the carburetor to move the filter away from the horn. A little blue LocTite on the male thread of the elbow will keep it from trying to unscrew itself from the weight of the filter and normal engine vibrations without having to tighten it into the carb body excessively. If it ever needs to be removed, heating the fitting with a big soldering iron will loosen the thread locker.
Jerry



"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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