with bog in position drill through hole in dead centre of hole at slight angle so u can screw up properly ( with bog protected with gaffer tape around hole to prevent scratching which i don't do now ) , put screw into plug a little bit ( so not to widen plug much ) and make sure STRAIGHT and place plug and screw together through hole in bog feeling for hole in same direction you drilled , using heel of palm on screwdriver to drive the plug & screw into the hole making sure the plug is fully home ONLY ( take tape of ) then screw up .
just a quick guide obviously being careful not to damage bog and not tightening the screw to much . i have been using this method for years with no damage and works 99% of the time oh and use brass screws .
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