MOTM

I am trying to put some of my motm modules in a recently aquired
modcan plan b cabinet with some extra spaces. 

since the distro card on my system only has  modcan power connections,
I am looking into converting a few of my motm to motm cables to modcan
to motm power cables.

I figured taht basiclly I have to in one end switch the -15 v with the
ground cable right next to the +15 and then somehow connect the
remaining two oper connections together so that they both connect to
the ground on the card and leaving the last connection in the cable
unused, correct?

any way I can do this without soldering or ? havent mess around much
with the ends of the cables...

thanks!
carlos