How about a soldering iron tip? If you are using a soldering iron, you may need to replace the tip. This is the same tip as the new L40 soldering iron. It's big, conducts and retains heat well, and is fairly durable. Take good care of this tip and it will last a long time. Aggressive brushing (wire brushing) cracks and wears out quickly. Coat the threads with graphite (or thermal paste if you have one) when installing the tip to keep it from binding, making later removal easier.