We were going to renew our lease, but the landlord 'threw a wrench into the works' [=('Brit') 'threw a spanner into the works'] by increasing the rent.
The storm 'threw a monkey wrench into' their plans for a picnic. [=the storm ruined their plans for a picnic]
an emotionally 'wrenching' experience [=a very sad/painful experience]
(..) - Yeah, we'll see. Got a nice place here, Roger. Lorraine and I always wanted a spot in the country. I'll sell you this one. Hey, hand me a wrench, would you? Hey, uh, it really means a lot to us to have you here. I gotta admit, I was a little bit skeptical going in. (..)2013 The Conjuring