This is a line from a Hugh Cornwell lyric from the Stranglers song "Dead Ringer" (from the "No More Heroes" LP 1977)
It's a person who puts a conker on a piece of string in readiness to play a game of conkers :)
Refer to Hugh Cornwell's (now deleted) book "Song by Song" (2001) in which he explains every Stranglers song from 1974-1990. The book now fetches fairly substantial prices when one is up for auction on ebay.
Lou Stringer's birth name is Louis Bernard Stringer.
Arthur Stringer's birth name is Stringer, Arthur John Arbuthnott.
Stringer Davis's birth name is Davis, James Buckley Stringer.
Lou Stringer is 5' 11".
Ronnie Stringer is 5' 9".
Sarah Stringer is 5' 7".
Starlene Stringer is 5' 3".
Chris Stringer was born in 1947.
Nick Stringer was born in 1948.
Terry Stringer was born in 1946.
Richard Stringer was born in 1772.
Dave Stringer was born in 1944.