Waters Xevo TQD Operator's, Overview And Maintenance Manual page 140

To fit the PEEK ion block support to the source:
1. Ensure that the grooves for the PEEK ion block support O-rings are free
from dirt and debris.
If contamination is present, use 1:1 methanol/water, applied to a
Tip:
lint-free cloth, to carefully clean the grooves.
2. Fit the O-rings (new ones if you disposed of the old) to the PEEK ion
block support.
To fit an O-ring in its groove, start fitting the O-ring at the notch in
Tip:
the groove, and then progressively work the ring into the groove, in
either direction from the notch.
3. Fit the PEEK ion block support to the instrument's housing.
4. Use the 3-mm Allen wrench to fit and tighten the 4 screws securing the
PEEK ion block support.
5. Fit the ion block assembly to the PEEK ion block support (see
page 4-43).
6. Fit the source enclosure to the instrument (see
4-64 Maintenance Procedures
The source components can be contaminated with bio-
Warning:
hazardous and/or toxic materials. Always wear chemical-resistant,
powder-free gloves while performing this procedure.
page 4-11).