spanner in the works

crescent spanner

An open-end adjustable spanner with a worm-drive thumbwheel. When the term adjustable spanner or adjustable wrench is used, this type (branded with any of many brands) is usually the type meant.

if it works, it works

if an action achieves its desired result, one should leave it at that; the outcome of an action is more important than the action itself

throw a monkey wrench in the works

Synonym of throw a spanner in the works.

throw a monkey wrench into the works

Synonym of throw a spanner into the works.

throw a spanner in the works

To introduce a problem, dilemma or obstacle, something unexpected or troublesome.

throw a wrench in the works

Synonym of throw a spanner in the works.