Then examined the part. Hmm, the rubber cover over the spring was missing. Again looked at some pictures on the net is it, on some not. Here at Amazon the cover was a picture. Without looks kind of ugly and a bit cheap.
A description for attaching and adjusting the seat angle is, the bias voltage can be set at the lower end of the support.
The suspension seatpost is good in itself, but it does not make the most stable impression. The adjustment, which is to limit the play of plunging rectangular tube in rigid pipe, is anything but good. Either then the suspension is too tight (friction) or it moves and the square tube twists in mild loosening the clamp on the rigid tube. Hinzubekommen there a satisfactory setting is a balancing act. And who knows how long it then remains.
I had expected from the seat post slightly more, I get like what is depicted, the suspension is due to just-called problems poorly adjusted.
The spring action is, you hammer out the setting, well.
With 4 stars, the part is well served. Anyone setting up trusts can order the part.