Waters Xevo G2 QTof Operator's, Overview And Maintenance Manual page 74

Caution:
great care from their square-cut ends. Touching their sharp end
can render the needle inoperable.
2. Carefully remove the capillary from its case by lifting it vertically while
pressing down on the foam with two fingers.
3. Over the square-cut end of the capillary, pass first the knurled nut, then
approximately 5 mm of conductive elastomer, and finally the union.
Union
4. Finger tighten the nut onto the union.
5. Ensure that the tip of the glass capillary protrudes about 7 mm from the
front of the knurled nut, as measured from the end of the nut to the
shoulder of the glass capillary, and then full tighten the nut onto the
union.
Glass capillary
4-12 Configuring the NanoLockSpray Source
Warning:
contaminated with toxic samples, do not touch the
sharp end of the capillary.
The capillaries are extremely fragile. Handle them with
Knurled nut
Elastomer
Union Knurled nut
7 mm
To avoid injury with a sliver of glass
Glass capillary