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I am not sure if they ever spun at all, so I took apart the brush head as shown in the manual, as another reviewer has commented I had difficulty putting the brush head sheath back on --I didn't force it but I kept trying to get it to go back and have the end piece be flush so I could screw the coin screw part back on.
The customer service kind of offended me by trying to suggest that I should have used a screwdriver I had mentioned I needed to grab one but it was a flat head used only to flip the coin screw cap gently! I was vindicated when I saw others have already experienced the same issue.