Waters Autospec Premier Operator's Manual page 201

Re-entrant coupling mechanism
Ion block
Mounting bracket
Peg
Tee-block and spring
When removing the mounting bracket from the ion block, be
Caution:
careful not to lose the spring, which is located between the tee block
and ion block.
To remove the re-entrant coupling mechanism
The re-entrant coupling mechanism connects the GC interface and the outer
source. The mechanism comprises a peg, tee-block, spring, and mounting
bracket.
1. Remove the 2 screws securing the mounting bracket to the ion chamber.
2. Remove the mounting bracket from the ion chamber.
Source maintenance 7-43