I barely would call this a custom, it's super simple... I took a super articulated movie spiderman that I got on clearance at WM for 5bucks and dremmelled out holes in his toes. IN these holes I stuck a couple of tiny magnets that I stole from an old set of fridge ABC magnets (they are actually pretty powerful little magnets).
here's the result:
I actually really liked this figure, the posing is difficult with those hips but once you loosen up the joints a little it really gets some nice poses. I wish there was a swivel joint below the knee for some different poses on the legs... but it works pretty well. The rocker ankles aren't done badly on this figure either.