Victoria Finnerty (victoria at OSMOSIS.BIOLOGY.EMORY.EDU) said this stuff: : DOES ANYONE HAVE INFORMATION ON SHARPENING NEEDLES FOR : TRANSFORMATION, PERHAPS BY USING A FINE ABRASIVE IN : AN OIL BATH ??? Needles pulled from glass capillary tubes have been adequately sharp in my experience. You may want to look into purchasing such a puller. -Adam