If the goal is to strip the nickel in advance of replating, I'd just let the plating house do it...they regularly strip old nickel before re-plating.
Glad to hear you got it off...in future one trick I use is the soak the part in "Kroil" which is a superior penetrant available here in the...
You might be able to burn out the carbon buildup on inside with a propane torch, but I suspect mechanical cleaning may be in order.
Nice lineup with those PL-53s....they have a very unique look!
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