Completed 25. File in a thingamajig. Course file then a couple of strokes with i fine file. Obviously bit slow. Length variation was about 0.3mm. So after checking with vernier 3 or 4 got a couple of additional strokes with fine file.
This is how, and end result selected from random.
End result 0.2mm variation.
Tried grinding and too hard to control resulting in tip groynd at an angle.
Drilling doesnt really work. By the time the flat is big enough i get to the hollow point.
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