Need replacement manual crank handle for jack

Hi. Im trying to figure out what kind of power jack i have. Is there any way to do that? There is no markings on it. Its an 05 roadmaster toy hauler and i need the manual crank handle for backup. I took the cap off the top of the jack. It looks like the end of a flat blade screwdriver if you were looking at it like you were about to poke yourself in the eye :) The handle in the link looks like it would work but the diameters wont fit. I measured the part that you would put your handle end on and it was 5/8" long by 1/4" wide. Thanks for any help. The pic of the handle is at the bottom of the page on that link

http://www.etrailer.com/Accessories-and-Parts/Atwood/87891.html?feed=npn&gclid=COj1t86H68ACFfA-MgodxVAAsg