6" CW vs. 5" CW

I just got my PC today with the 6" CW/backing pad and took the original 5" weight off. I went to put the 6" on, and noticed there is a little rubber nub on the PC itself.



The 5" has a spot cut out for this nub to fit in, the 6" one doesn't. Am I supposed to just put the 6" one on over it and tighten it down?
 
Awesome, thanks, I jsut didn't want it to throw off the balance and cause everything to shake. I'm anxious as hell to try this thing out, but in the next 10 days its barely supposed to break 30, nevermind 40.
 
Don't mention it. I think I even posted the exact same question when I first got my PC, it's a very common concern.
 
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