Stretching the center of a model

I’ve got a model that a former employee made for me. Recently we have not been able to source one of the original components and have had to use an alternate. Problem is that the connector on this one sticks out slightly more. The shafts that hold it together framish against this specific point. Right now I’m bending the connector so that it fits. If I could stretch the center of the model eight to ten millimeters then it would just fit. Is there a way to do this in sketchup? I’m basically trying to elongate the two parts, the top and bottom of the housing slightly.

Probably just a matter of selecting the right geometry and moving it but kind of hard to be more sepcific without seeing the model.