2 primary Weapons in one slot

Here is a little tutorial how to get a second weapon instead of your flag
1.) activate and deactivate your flag some times
2.) drag the second weapon on the flag in your inventory(on the right side, not on the left side)
3.) when you see a part of your weapon in theslot, where should be your flag, you have done it right
4.) play a game, press 1 to get your other weapon

UPDATE: i uploaded a little video if you didn`t understand

do a tutorial with pictures or a video bro :s

please