... I also found this:

Fiddlesticks: 'It's all fiddlesticks' implies that it is all nonsense.... I can't find a modern origin but, in 1811 "Fiddlestick's end" meant "nothing". The ancient fiddlestick (violin bow) ended in a point, hence, metaphorically, used to express a thing terminating in nothing.

http://members.madasafish.com/~jbriggs/book/e & f.htm

(both above sources thanks to MaxQ and his magical reference page: http://maxqnz.com/References.html)