Pretty sure it would be easier just to get a new bolt instead of new cranks haha. I wouldn't go for the Conjoined ones, I've heard they weren't too good. Profile's or Hollowbites/Powerbites would be your best bet.
lots of my friends have the wombolt and the fly 2.5 peice cranks and they havent ever had any problems with them. i would get a pair. and they are really good. they dont suck at riding at all. besides odsy just came out with the twombolt so all that shit should be worked out if they had that many problems