Hymer S510. Have removed the plastic insert on driver door LHD, and there is a steel plate with pre-drilled holes for M5 machine screws, and a pre-drilled hole for cylinder lock, to fit extra deadlock. I believe that this was intended to fit an Abus 4010 lock. Does anyone have knowledge of of this, and how do we tidy up the resultant hole with the plastic cover removed. Stewart.