"I used a paper clip to connect two pieces of paper."
Translation:cha' navmey vIrarmeH mavjop vIlo'.
We have a canonical sentence that shows the (plural) objects of rar are the things that get connected together, and the subject is the thing that puts them together.
Once in a while a Klingon verb will let you do it both ways (e.g., something that stops can mev, while you can cause something to stop with mev.), but without any evidence of this, it's safer to just do it the way we know you can do it.