Alternate method. Pack the wrench and a spare tube and walk the bike to a road or trail with lots of bike traffic. Stand there with a properly forlorn expression and I can just about guaranty that someone willstop and ask if you need help within a matter of minutes.

(in case there's any sensitivity about this being a sex related reference, it isn't. Cyclists tend to be helpful toward fellow cyclists and many will stop to offer help to someone who appears to need it)