The easiest way would be to travel back in time to one week prior to HoW and farm Key Chests. 6-10 spinmetal every chest depending on the amount of times you can ride your sparrow to and from different zones and the chest.
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Lol I remember those times
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I have so much spinmetal from those chests and Bolt-Caster farming, I could mend the hole in the Traveler twice