Waters Autospec Premier Operator's Manual page 175

2. Remove the filament assembly from the ion block.
3. Remove the screws securing the filament terminal blocks to the
filament.
Filament terminal block
4. Remove the filament terminal blocks from the filament.
To remove the bayonet support
1. Remove 1 of the 4 screws securing the bayonet support to the ion block.
Source maintenance 7-17