I noticed that the handle post hinge on my Dahon Speed D7 now requires attention much more often than it used before. Unlike main frame hinge which remains tight for long after adjustment, this one now requires tightening at least once week, otherwise handle post becomes shaky.
Red arrow on the image below shows the 10mm nut I have to tighten to move that metal "foot" above a bit closer to the edge to the to secure the handle post when bike is unfolded.
(don't know if I managed to explain the process clearly enough, but Dahon bike owners should get the idea, I believe)
This is an old bike, but until last 4 or 5 months I only had to tighten that nut once a month or even less often. Now it's much worse and getting worse with time.
I have marked one of nut's sides to determine if the metal "foot" started to wear out quickly or the nut is somehow loosened moving down the screw. Turned out it is, something forces the nut to rotate at 60 deg or so every week, so I'm not actually tightening it but returning it where it belongs.
To be honest I don't understand the mechanics of this process (what makes it to unscrew) and wonder if this is something I can fix or I'll need a new handle post soon.