[3ZZZ]

Cut inch off the long end of allen wrench, put in screw and several firm blows with a hammer. Usually will make the difference.

[Windflier]

Cut inch off the long end of allen wrench, put in screw and several firm blows with a hammer.

I'm going to call the manufacturer in the morning to verify that the screws aren't left handed, then apply some better penetrating oil before proceeding. I like your idea.