I was interested in buying one of these because my hand tends to cramp up when playing my ds lite. I cannot find any specs on this item at all. It comes with two retractable stylus' to insert inside. My question is, can I use OEM stylus inside this or do I need the retractable ones? I don't know if anyone has owned one of these or possibly knows if retractable stylus' are the same size as original ones. Thank you to any feedback even if it is minor.