Stehno's suggestion is the same method that I've used quite successfully for many years. Try to get a grip with a socket around the post (just use your fingers around the socket - don't torque too liberally with a ratchet driver or you may strip the threads).
Also, place the spade lug onto the post at about 45 degrees counterclockwise from the desired final position. As the post rotates tighter, turn the spade in a clockwise direction along with the post. They'll end up at a much tighter final position by doing so.
