How can the stainless steel grinding point be accurately grinded?
It became a mother and child. This is not enough, then use cardboard (cigarette shell can) roll out of it, with a sticker wrapped tightly, and then gently polishing grinding and grinding mouth along the way, with the parent set in other stainless steel tube, with a mark strokes and grind success.
This is a little technical content, first calculate the drawings should cut deep concavity, then carefully place the anastomosis of fine grinding. Until fully consistent.
