Decided to KIV the arm with the stuck screw thread for now and bought 2 sets of spare arms . Guess I don't have that much time to tinker with it right now, but will try to get the screw thread out when I have the time.

Anyway, want to ask a really noob question. I saw a lot of 419's here and also on Marc's that you guys swap out the black hex screw on the top deck and other parts for blue aluminium ones. What good does it bring to the overall car performance other than cosmetics. Because in my case earlier, the alu ball nut broke off because it was not that strong compared to steel ones. What about the difference between the alu and titanium one? Which one is better. For me, I guess I really fancy the blue ones and now considering is it worth the cost to "upgrade".

Cheers