Re: No main or dipped beam.
Top tip I learned for improving connectors in blocks is to get the male side and slightly twist every connector with some long nose pliers. Not enough to properly bend it but just enough so it has a very slight offset and fits tightly into the female side, giving a more solid connection.
That and spraying them with contact cleaner and giving the metal a sand back as mentioned with some wet and dry wrapped around a small screwdriver.
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