@towforce The switch is sealed all around. Nothing can go inside unless the seals fail. The metal lever on top of the switch is to avoid horizontal movement being transmitted to the button. It also creates a buffer zone by flexing when the pressure is too high. This effectively reduce tolerance requirements for production. It should reduce the wear slightly and make the switch work more reliably.
I think some problems with chinese parts is softer metals or wrong metals used. Sometimes they are missing weather sealing, andthe electronics seem to use cheaper components. So perhaps lifetime is not so long. But they work for a while
In the past I bought recirculation flap servo from china and interior electronics was bad. For example there was a round resistance strip where an arm turns to determine position of the item. If I remember correctly the VW unit use some black graphite strip and china unit was different (cheaper looking) strip. Also the VW part's arm which runs on the resistance strip was really soft designed to not scratch it. But the chinese unit had harder and sharp metal piece. I did not trust that it will last very long. I ended up swapping the broken part from china part into genuine vw part.
But some chinese parts are actually quite usable...It is a hit or miss situation really. They usually work but either slowly damage the car or slowly they get broken themselves.
I can kinda verify this.
I've been dealing in an awful lot of Chinese knock-off/clones lately. My recent experiences have been with with key fobs, some data cables, some light motorized machinery/tools, and other small items.
As with anything, price --> quality. Closely related.
When physically comparing a Chinese variant to a genuine one, the difference is immediately obvious, but still sometimes hard to specifically detect. For example, I bought a couple of key fobs for my 2000 Golf off Alibaba. $9ea. From the outside, they look 97% the same, but not perfectly
sized properly. Maybe a little bit of plastic burr left over. Maybe defects in casting. The key blade metal is a slightly different color/sheen, and likely a softer cheaper metal, such as mentioned above. The key blade also doesn't fit flush when closed, and it's a tad loose when opened.
Very small things, but when you compare to a Genuine part, it feels much more sturdy, no play/looseness, etc.
Sometimes the Chinese engineers (it's more than one guy out there, mind you), may miss small details, or omit them entirely to keep costs low. It still boggles my mind how they can produce a door handle for $2.41 on alibaba and ship it to my front door for $1.59
It's 2018 (almost 2019!) and these guys have access to powerful production capabilities. AutoCAD, 3D printing, injection molding, etc etc. China, as a country, has had this stuff for a while now as production has slowly shifted vastly over to China. But now the technology (a 3D printer for example) has come down greatly in cost, and become accessible to even small Chinese firms who can quickly design a shoddy CAD design, pump it out of a low-end 3D printer, or injection molding factory, and shill it on Alibaba.
Even if it is fun to get carried away at uber cheap prices for cool stuff on Alibaba or similar Chinese sites, I always exercise a high amount of caution when considering something precision made, an integral part, or something with high labor time to replace. For example, I will always buy high-end wheel bearings. Never any Dorman junk. I want my wheel bearings to be good, and I don't want to bust my knuckles doing the job twice over.