Glasses;
I don't know about the SunCom in particular, but ussually the bottom of the joystick case comes off with 4 screws.  These screws are kind of hidden.  
On the bottom of the joystick case look and see if there are rubber pads.  These rubber pads generally use a very gumy adhesive and can be removed and replaced.  Remove these rubber pads and see if there are screws under them.
Good Luck!   

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Mino
The Wrecking Crew