Good advice is to check Ebay etc. when you need a new B4 kit, sometimes you can find the US made ones on there, which are
a lot better.
When I still had my old US one, I broke about 1 or 2 things in a whole season. After I bought a new Chinese one I had to be careful not to look too angry at the car, to avoid breaking it.
Thing with Chinese factories is: they always make one good batch to convince you, then they start sending rubbish