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i just held my controller for a few mins and moved my fingers about and around that area seemed perfect for a scroll action just move your finger side to side
remove the trigger assembly and install it there, no mods to the case required, well none to the outside anyway, it will feel natural, and look the best.as for the sinc button, you will need a pic to do that, it theoredicaly can be done with a jk/latching flip flop but its not an easy task
what about the little mouse wheel on the macs?