I had a similar issue last summer with a pair of Ofmega cranks. I used a harbour freight gear puller and few wrenches placed across the spider to remove it.

I agree with SJX perhaps we need a few pics just to be sure we are all talking about the same thing. it seems to me you are saying the threads where the dust cap and crank puller goes are stripped out yes? also as Fiestbob says are yu sure you have the right tool? some of these guys know by sight wich of the three (3) tools you need.