For me, I would add:
1 repair kit for each REO type.
1 spring for each REO type.
2 spare screws for RM2
2 spare o-rings for RM2
2 spare juice bottles of each size
I know this is overkill, but I feel better knowing that I can get any of my REO's working in the event of a failure. (Never heard of one, except from the coil standards committee.)
^ This is NOT overkill!
Definitely one repair kit plus extra spring for each REO type (wood vs metal)
One RM2 for each REO plus one for micro coil experiments plus one for backup.
One pair of post screws for each RM2 (using more RM2s increases the probability of losing a screw)
One pair of o-rings for each RM2
At least 100 feet each of Kanthal A1 or Nichrome 60 in required gauges, at least one for each RM2.
At least one bag of organic cotton balls for each RM2.
One of each size REO bottle per flavor of juice (I'm up to 26 now), filled, ready to go, and loosely rubber banded to its larger juice bottle.
Quantity of each size battery = at least the number of REOs using it plus one for backup and a second for rotation.
At least one primary and one backup 12 volt capable, intelligent battery charger with appropriate # of bays
2000 watt portable inverter generator for when you've depleted your vehicle batteries with the charger, plus a siphon hose to get gas for it from your vehicle (also useful for less important things like a sump pump, refrigerator, etc) ...okay, maybe that's overkill

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