I understand your point, but after working in a number of factories, I've noticed that most products, OEM or not, are made in the same factory, using the same machines, and sometimes even on the same day. I always make sure to get a parts warranty in case something goes wrong. I'm hoping this is the problem, but it's mostly just a test to see how stretched the chain is and how much work I'll have to do. If it's not, I'd rather spend £25 now than hundreds of pounds later to find out the problem is severe.