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You need to disassemble the primary. I let my Indy do it or the dealer. It's all labor. I have only had to replace one belt in the almost 10 years of riding HDs.
Add together what the other chaps have said! Entire primary has to come off, including clutch stator and inner casing. Essential to have a factory service manual and get in any extra tools you may need. Or find a local friendly indy.