Waters GCT Premier Operator's Manual page 233

4. Fit the trap and ceramic spacers in the ion block.
5. Fit two ceramics on the rear of the ion block, one on the repeller and the
other on the trap.
6. Fit the trap contact to the trap.
7. Fit the trap/repeller ceramic isolator to the repeller.
8. Fit the repeller contact to the repeller.
EI/CI inner source maintenance 10-29