One Battery install, while I was waiting for it to charge up before installation, tried expoxying the nut in place , worked good. Small coating of Dielectric grease on. Treads of bolts in necessary.
I use a rolled up foam earplug under the nut. It expands to hold the nut in place and can be left there forever. Give it a try.
Try putting a battery in a Ford Escape or Transit, an auxiliary battery in a Jeep or a Benz.
I slide the foam from the packing peanuts under that dam nut before installing the battery. It will be there forever they last.......Allow me a little rant here, just replaced two batteries on both my bikes, and would like to rant at battery manufacturers, why, for all that is Holy can’t we have that infuriating little nut be big enough to avoid the friggen crazy balancing act needed to thread the leads into the posts? Cripes trying to A.) Keep it in the posts, B.) line the thing up, C.) Get your additional leads for tender pigtail etc. all in line before you loose it entirely! I wound up cutting up that red plastic positive post cover and using it like a shim under that satanic tiny nut! Such an exercise in patience that could have been a 5 min. Job, glad I had adult refreshments afterwards!
Rant complete, thank you
You have two "issues". One, holding the nut in place. Lots of great suggestions there. The other is installing a "fuse block". Here are two I've used.Just find a way to shim the nut in place and these are all good ideas. In addition the answer for some may be to install a fuse block or power distribution device in order to cut down on the assorted pos/neg wire connections that accumulate.