I cleaned up the old (probably the 35 year-old original) stuffing box on the wire wheel. Although it’s scared, it still works. The threads are still good, and it assembles/disassembles easily. Also, it appears that the new flax/stuffing I used two years ago is virtually still new.
I am so impressed with any boat part I’ve used that was bronze. This stuffing box would have been a mass of corrosion beyond renewal if it had been stainless.