Mmmm,not a fan of e-z outs ,their ok to use on bikes,cars etc but the"tap of a hammer" can ,if not administered by someone in the know..like yourself Rooster
,just make the prob. worse.He doesn't say where the screw is or what its fitted to/holding together so the methods Philip and myself gave,while not being the most technical "may" be slightly easier on the marker as hammers anywhere near markers in the hands of the inexperienced makes me wince and I wouldn't recomend drilling it out himself either.
Like the beer ploy though
and your'e spot on about Allen key sizing