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Another inexpensive upgrade inspired by others that have done similar covers for the front axle tube. I used tapered chrome pull knobs along with 8/32 threaded rod, orings on each end and a washer to cover the large hex opening one the left end. The home depot bucket gives scale to how long the threaded rod is (I joined a few sections). The orings help snug it up and I have over 500 miles without the knobs coming loose at all.

Rich