I have an ac adapter for my t2i and a switronix power supply fir my T2i. Both use a cable that goes to a small dc coaxial 90 degree connector. The coaxial connector fits into a fake battery, which, when installed in the battery compartment, supplies power via the external power source. I want to build an extension to this power cable. Does anyone know the size of this plug, because i need to order it online, as it is not available in stores anywhere. I need a female plug and a male 90 degree plug that i can put on a cable with a length of my choosing.