I've been working on setup on my TC6 and noticed on some setups, the team drivers make changes under Outer Ball & Shims, such as black 2mm, or silver 3mm. I'm assuming this is just the color of the ballstud and the thickness of shim? What is the difference between black and silver ballstuds? And are you guys using the 10mm ballstuds to make it fit with shims?