I've had that note from them before when a part was definitely faulty. So, just ordered another.
I'm not sure that it is faulty in this case. I'm in UK at the moment so don't have access to any information but, I think this is an interference fit pusher assembly and the pusher part is probably loctited to the pin at the factory. So, disassembly would need heat or you'll shear the thread. Let's see if Al has a comment but (if it's the one I'm thinking of) you fit these as an assembly so no need to disassemble them.
Sad to say, I think you'll need to buy another.
Cheers, Chris
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