I am struggling to get the cranks out of my frame. They are Truvativ Powerspline. I have the frame stripped down except for crank and bottom brackets. When I look at the side, there is a 7mm socket with a plastic cap surrounding it.

I have wrenched on the socket with my hex keys until my hands hurt. I want to make sure that I am turning the right direction (counter-clockwise to loosen on both sides). Can anybody confirm this? These are the outside bolts that are exposed normally.

I have tried tapping the hex key with a hammer. I have pried out one of the plastic caps and filled the space with oil. I am letting it sit right now. Any other suggestion? Should I just pull until my hex key snaps?

The last time these were off was about a year ago when a guy at a bike shop took a look at the BB. He didn't seem to have any huge amount of trouble with them, but I didn't watch closely.