If the tip is worn enough to be unreliable or inoperative, it can be built up again with TIG or micro-welding, then brought back to spec. Cracks or other damage can also be fixed this way. This would be more important for a numbered part than an unnumbered one.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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