I measured the extractor springs I have on hand;
Original In the pistol was, wire size=.033”,length=.305”,
Od =.1915”, coils=5
Wolf #10lb #27129 wire=.0295”, length=.325”,od =.179”
Coil=4
Numrich r13811,s&w#102020000 wire=.031”, length=.304”
Od =.1935”, coil=4
Midway #421788 072020. Wire=.031”, length=.296”
Od =.193”, coil=4
I took more photos, there is some wear in the slide extractor grove just above the hook. It can be felt with the tip of a stick. (Photo 4) Maybe .002 felt. As for springs the original has the most coils and the thickest wire. The next best choice would be a toss up between the numrich and the midway with .031 and 4 coils. As someone mentioned I am not sure where wolf spring gets their data but they list #271129 as a #10lb extra power, it has the smallest wire @.029 and the smallest
[email protected]. Go figure?
Looking at the numbers seems like taking the original spring placing a .125 pin inside of for support and giving it a stretch so it was .325” long would make it have the highest extractor hook force with the most spring coils.
At close magnified inspection of the extractor hook, there was a black residue where the hook locks on the case. Almost looked like caked on graphite power. It has been cleaned off.
I am thinking the high spots on the wear in the slide extractor groove just above the hook should be hit with a hard Arkansas stone. I am thinking if the high spots are gone they will not interfere with the hook operation.