

Has anyone ever seen this kind of dropper post? It seems to work, but I am clueless as to how to make it work.
The red part has to be pushed in to activate the mechanism, but the cable go straight through, so pulling doesn't do much…
It's a no brand dropper that came on a Garneau gros Louis 2, so I can't find anything online. The only thing written on the post is TVS125LJ CB58E87..
Thanks for your help!
by Virtual_Bike_3417