Let time be your helper on this. Suggest applying some heat ( propane torch) to the aluminum boss that the screw goes into… just warm, not enough to burn the paint. Appy penetration oil ( I don’t think much of WD40 as a penetrant) , then light hammer, tap – tap on the head of the screw. Then go have beer. Come back a few hours later and repeat, and repeat … maybe until you run out of beer. Can you grab the head with vice grips? maybe a long nose pair?
Joe B
