Battery box plug

[sammysamsam]

Shot out a pm to Andy and figured i would see what you guys suggest also.

I cant deal with the battery plug for my bait tank anymore. The wires from the pump keep slipping out of the male plug that i plug into the battery box or it doesnt make good contact inside the female end. Tried electrical tape but that doesnt work. i already bought another battery plug from oex and it just doesnt tighten down enough to hold the wires.
What can i do? Plus, once you tighten down the little screws on the plug, there is no way to open them again or else you strip the small brass screws. Do you have any ideas other than buying another $7 dollar battery plug and going through the same process? Im just frustrated with this thing since my bait keeps dying.