The material is very good. There was a powder coating on the threads where the screws run. They grease the threads. I ran the threads with the supplied screws. A little further a little further ect. I haven't had any problems with threads this way. Check the fitment of the replacement part to ensure you have selected the correct hole pattern. It's difficult to get to the bottom screw, but you can use a regular wrench. A ratchet wrench would make the job easier. My set didn't reach 19mm.
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