Originally Posted by tomtomtom123

The threaded hole was meant to be future-proof in case I switched to a frame that only has one eyelet so that I can attach the mud guard strut to the hole.

The mounting hole is not threaded, but I made it 5 mm instead of 6 mm that the original strut had. I noticed that the original aluminum strut with a 6mm hole had indentations from the bolt threats that seem to imply that the 6mm hole being too large for the M5 bolt allowed it to shift around on the bolt.