Wow, the nutsert's themselves aren't that bad, but the kit to get the tool is crazy expensive! I haven't found just the tool yet, but the kits from Fastenal are $145-$244. I'm sure they come with more fasteners than I need though.

A person probably wants to make sure those threads are well lubed, and removed periodically to prevent siezing. I gotta imagine those are a bugger to remove once corroded.