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Related to Spanners: combination wrench

throw a spanner in(to) the works

To disrupt, foil, or cause problems to a plan, activity, or project. Primarily heard in UK. We had everything in line for the party, but having the caterer cancel on us at the last minute really threw a spanner in the works! It'll really throw a spanner into the works if the board decides not to increase our funding for this project.
See also: spanner, throw, work

put/throw a spanner in the works

  (British & Australian) also put/throw a (monkey) wrench in the works (American)
to do something that prevents a plan or activity from succeeding We were hoping to get the project started in June but the funding was withdrawn so that rather threw a spanner in the works. The sudden withdrawal of the guest speaker really threw a monkey wrench in the works.
See also: put, spanner, work