help with 9.6v. battery mod. for sig 552.

[Neckbone]

O.K.
I bought two 9.6v humpback batteries for the sig552.They are made specifically for the sig 552.The batteries are supposed to fit if you take out the battery tray and take off the side rail and shave down the plastic that holds the 2 square nuts in place that attaches the rail.
The batteries fit in no problem but I cant get the foregrip back into place as the 2 clips that attach the gun and the battery together get in the way.
I have tried to re- wire the battery wires but still doesn't help.

Any help would be appreciated,Thank-you
email me at airsoftsas@hotmail.com