Completely flat joysticks?

I will be making a GCp in the form of an oversized DS. The problem is, I need a flat joystick like the 3DS has. I think I may need to use the 3DS pro circle pad mod or something to get a flat joystick. I need help. Somebody, please, advise how to use either the 3DS one, another one, or how to make one.
 
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