Originally Posted by
Mr Zippy
Another less embarrassing trick is to use a longer blade screwdriver. You put the blade on the part where you think the noise is, and your ear on the end of the handle. More accurate than your method, OTOH though, you want to be careful not to scratch what you put the blade end on, if visible scratches matter.
Originally Posted by
Panthers007
Put down a piece of Scotch-Tape where you're going to place the screwdriver. Or similar.
Put the tape on the end of the screw driver and you can check several potential sources of the noise without getting tape all over the bike.