I know this is kind of late, but you don't need to replace copper washers. To re-use them, heat them up till they become cherry red, then cool them down either by letting them sit in the air, or dunking them into water. This will anneal them, allowing them to become soft enough to form a seal again. The bonus of this is if you don't have a blowtorch or heat tools for whatever reason, you can just use your kitchen stove.
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