plays, re: duane im not sure what u r getting at, i am positive gryph is correct about the coricidin, my source is scott freeman's book, "midnight riders" which i read cover to cover several times, being an allmans junkie in my youth.
slide guitar was originally called bottleneck guitar because players would use the neck of a broken wine bottle to get the effect.
it was duane who always used a coricidin bottle.
while we are on allmans trivia, who was elizabeth reed? (no google please)
BTW, for the big crowd out there who thinks layla is a guitar masterpeice and witness to eric claptons virtuoisity...the slide in the peice, both the fast first part and the second slow part, is played by duane allman, check the credits.
the slide in "while my guitar gently weeps" is not played by george harrison, its played by eric clapton, who was inspired at the feet of the great duane allman, probably the best slide guitarist who ever lived.