Thanks all, I gave them a tap with welding hammer to make sure there wasn't any hidden holes and they seemed solid enough. I'll get on to looking for a local shot blaster once this lockdown is over.
MB - How do you get to paint the insides of the arms? is there a special nozzle I need to buy that goes inside, or is it just spray liberally and hope it reaches all areas?
No desperate rush, but I'm hoping to get it done so I can swap them while my current arms are still ok, and them give them the same treatment to keep for future.
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