To get both on and rightside-up, do this:
1. Take the blades and wedges off the extenders
2. Connect the wedge to the extender, like you're going to put it on, but don't click. Instead, fire the snappers and put it on before it retracts
3. Now that the wedges are out of the way, put the blades on
4. Once both wedges have been eFFe'd and the blades are on, go to the test garage and back. Both the wedges and blades will be hooked on
It's pretty simple.
Oh. Thanks man. It was really helpful!
The eFFe glitch is magical.