I wanted something like the Minoura Besso or the Cronometro NOB, but with a direct attachment method similar to the Low Down that would allow me to use the existing 5mm threaded eyelets on my front fork: I happen to have a plethora of unused threaded eyelets: one on the dropout, another midway up the front fork, designed for a low-rider pannier rack, and two on the front rack, designed specifically for mounting lights. I was thinking of buying a Low Down mount, then threading it to some threaded rod, and finally threading that into one of the eyelets, but I didn't feel like paying $25 just to relocate my headlight. Instead, I decided to go the DIY route. I raided my parts bins and found an old flat handlebar from an 80s mountain bike:
Perfect! I figured I could cut off a piece, skewer it with some 5mm threaded rod between a couple of washers. For $1.50 worth of hardware, i could make my own mount. Here's how I did it:
First, I sawed off about 2.5" of handlebar to serve as the main part of the headlight mount. I could have gone shorter, but if I ever decide to upgrade my lighting to something really large and bulky, I may want the extra length:
Next, I soaked it in some paint stripper and scrubbed off the white paint, exposing the bare aluminum. To assemble it all together, I needed to figure out how to keep the long 5mm threaded rod centered inside the aluminum cylinder. I was going to use a wine bottle cork stuffed inside the cylinder, but I couldn't find one narrow enough to fit. I ended up centering the rod inside the cylinder and cementing it in place with hot glue (the kind that come as sticks, and must be dispensed from a hot-glue gun):
Lastly, I fitted galvanized fender washers to both ends, capped off one end of the rod with a 5mm stainless steel dome nut, and fitted a small aluminum spacer to the other end:
I chose to thread the mount to my low-rider threaded boss:
The result is a very sturdy, rustproof headlight mount that utilizes a pre-existing 5mm threaded boss, and that cost me only $1.50. I've never had a headlight mounted so low before, and I haven't ridden it at night yet, so I can't yet comment on whether I like it there. As mentioned above, some people prefer this location since it is supposed to provide better illumination of the road, but if I decide I don't like the headlight mounted so low (for a city bike, I prefer to have illumination that maximizes my visibility to others, as opposed to maximizing my visibility of the road), I can simply relocate it higher up to a threaded eyelet on the front rack (included on the rack for just that purpose), which would place the headlight directly underneath the basket (see above photo, zoomed in below):
If anyone is interested in making one of these, I'd be happy to provide a piece of handlebar stock... I've got plenty! I may even be tempted to make a few of these complete mounts for sale at a modest price.