As mentioned above, you can unbolt the converter and slide it back into the pump. The converter SHOULD slide so far back it damn near, or even touches the case. I say it may or may not touch the case because of dimensional tolerances. But if it doesn't touch the case it better be damn close.
If you are lucky (I'm not) you might be able to grab the converter and spin it a bit while trying to push it back and it MAY go back into the pump. I've never been able to do it. In fact, as a lesson to my friends who don't listen, when I catch what they've done, I make the pull the trans just so they learn to slow down and do it once.
Yes, I'm a prick and difficult to get along with. I don't like doing things twice. Especially when it costs money to do it wrong.