That is not only unnecessary, but the original poster (and founder) only used a basic micro-usb to female usb adapter.
Originally Posted by doctj
If I have time later I'll rig up a DIY USB OTG cable (that is assuming there IS anything different, and a quick look at that article has me believe the only difference is internal), but I very much doubt it'll make any difference.
EDIT: Yep, as I suspected, it's identical:
When attached to a PC an OTG device requires a cable which has a USB Standard-A plug on one end and a Micro-B plug on the other end. In order to attach a peripheral to an OTG device the peripheral either needs to have a cable ending in a Micro-A plug which is inserted into the OTG device's Micro-AB receptacle or the OTG device itself needs an adapter cable which has a Micro-A plug on one end and a Standard-A receptacle on the other. The adapter cable enables any standard USB peripheral to be attached to an OTG device. In order to attach two OTG devices together requires either a cable with a Micro-B plug at one end and a Micro-A plug at the other or can be achieved using a combination of the PC cable and adapter cable.