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Transpector CPM Operating Manual
4 Remove three nuts (F) and the washers holding the filament assembly in place. 
Be careful; do not to lose the two ceramic sealing disk wire hold downs. (See 
Figure 7-18.)
Figure 7-18  Removing sensor filament assembly
5 Carefully remove the filament assembly. (See Figure 7-19.)
Figure 7-19  Filament assembly removed