Hi all, customer has requested I find a key for the security screws that bolt the front cover of his bulkhead light to the base (To change the lamp). Haven't seen anything like it before the screws have a raised "+" shape so the key would be the opposite. Anyone have any ideas? I can open it using snips/long nose pliers but not ideal. House is a bit of a bodge, with another outside light being controlled by an emergency key switch, etc. :90: