Assign Space Bar as a keyboard Short Cut

In Interface Builder, using the Applescript environment, I would like to assign the “Space Bar” as a keyboard shortcut to a menu item.
Obvious ways to do this fail.
Is there a secret trick to accomplish this, or is there a Strict Rule that forbids me so?

You could try:

set key equivalent of button "buttonname" to space

Or you could use " " instead of space. Not sure if that works, but it’s worth a try.