The problem this solves
Leaving a bike in gear on a slope and relying on engine braking works, right up until the clutch gets pulled — accidentally, or by a curious kid at a market. This is a cheap mechanical parking brake lock button from AliExpress: a simple spring-loaded lever lock that holds the bike even if the clutch is disengaged. No wiring, no electronics, just a spring.
Installing it
The install is a pivot bolt swap with a brass sleeve for correct sizing, followed by a calibration step so the lock engages cleanly at the right point in the lever's travel.
The real test
Rather than just showing the install, the video puts it through an actual slope test — the clearest way to prove the lock holds the bike even with the clutch fully pulled in.
Verdict
For the cost of the part, this is a small, purely mechanical fix for a real gap in how motorcycles handle parking on an incline — worth it if you regularly park on slopes, at markets, or anywhere a bike could get bumped or a lever grabbed.