I ordered several of these props and they look fine. I've used an 11-7 on an OS 61 and it worked fine. I had to drill out the centre and is worke d great - balanced perfectly. No problems
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These are injection moulded. It's impossible for the hole to be off-centre. Did you re-drill the hole to fit your motor, and screw it up? There is absolutely no way a moulded prop can have a hole off centre on 1 Propeller!