Unless they've changed them since 2013, the part numbers for the 645's were/are:
235680000 $20.06 O L EXTRACTOR
235690000 $20.06 X EXTRACTOR
235700000 $20.06 O S EXTRACTOR
They didn't list it in the commercial part list, but they also offered a couple heavier extractor springs for the .45's (and 10mm).
The standard spring is part #10202, but they also have a
Heavier than standard, #23563 and an
Extra Heavy spring, #23433. The use of one or another of these springs ought to get the normal tension up in recommended the 5-6 1/2 lb range (measured with a force dial gauge using the appropriate hooked extension to get the reading at the moment of extractor movement, or 'deflection').
The ultimate "check" after the normal bench checks are good is that the tension isn't too light (failures-to-extract), or too heavy (failures-to-feed), and that the empty cases are extracted and new rounds fed/chambered during live-fire.
As
paulj84003 mentioned, sometimes the guns done on the older hand-controlled equipment may require some additional attention when fitting repair parts. That's why it's prudent to have it done by someone with the training and experience to work on them.
645 Extractor
Linear Mode
