1.5" Bulkhead Wrench
thingiverse
I needed a 1.5" bulkhead wrench for my aquarium stand that fit into a very tight spot perfectly. This allowed me to turn it easily by hand without any hassle. It's a simple solution. You can also shorten it quickly to accommodate specific needs. If you plan on keeping the length and using the slots for extra leverage, I highly recommend printing it solidly. Safety should always be your top priority.
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