help with gmod (obviously)

hiya, i noticed in a few tutorials on building things, the people can rotate items like phoenix mod pieces on an axis. by this i mean that they can make an object perfectly vertical/horizontal. my controls are

A- forward
SHIFT- left
Z- back
X- right

Press E (or your use key) while holding the prop with your physgun.

I think he means when you press Shift-E it aligns it to an axis so it is perfectly straight (might not look straight depending on the map you are playing, but it is O_o)

You have a very strange key setup. I’m basically on default, except for arrows instead of wasd.