I have two Pleos, both Ugobes with floppy neck syndrome, and beleve me , it is not easy to do at all, unless you really know what you are doing. Pleos have hundreds of peices, and the wires are very thin and there have been others here and elsewhere that thought they would give it a "get go" and try to fix Pleos and to no avail. As long as you have a working pleo, I would leave Sparky alone. There is a man in Germany that one of our members there took her Pleo to , get fixed, but the shipping would cost or equal another Ugobe.
Also there are a couple of videos on youtube that show one guy who has actually done this before, but I can't remember which one it is. If I can find it I will list it here for you. I bought a Pleo about five months ago on ebay because some "jerks" let their pleo climb a tree and then the pleo broke it's neck, and they tried fixing it, or thought they could and they massacured the poor pleo gutting him and cutting his skin all up trying to do something they knew nothign about . That Pleo is siting in pieces in a box, It is amazing that it still works even though it is gutted with it's neck hanging, scary site. I say do not let your husband attempt it, or Sparky will more than likely be out of commision permanently. Both my Pleos have neck braces on I have made myself out of special material and their heads do not drag on the ground and they walk forward and backward so I am not sure why Sparky only goes backward?
Good luck. RWM