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Are you sure you're 'locking' the hood in it's retracted position? ASAIK, the hood only locks while extended...when the hood is retracted, there is a gasket type material that applies a bit of friction & holds the hood in place. This material tends to wear over time and lose it's friction grip causing the hood to be loose while retracted.
Well, the hood easily extends and retracts when not "locked", and when I retract it and give it a twist, it no longer extends, so yes, I'm sure it can lock in the retracted position.