Gilles Berthoud Brake Spindle Screw for Mudguards

I recommend this product

I don't know where else you'd find something like this, other than SJS. These are nicely made, useful components for your – my – old steel audax frame. It saves the faff of swapping out the bolt for the front brake with a hex key fitting, and it's a tidy way to attach the mudguards. It depends on your set up and how fussy you are: one comment would be that the 9 and 13mm versions have different length outer hexagon sections. The 9mm is slightly longer. If you want them look the same front and back, get two 13mm and file one down for the rear as required.

I recommend this product

Well machined and tightening with an external hex is really easier than with an internal. Long threading and internal threads to the rear end allowed me to mount split mudguards (fenders) and fatter tires on an old 80s steel Trek.