I love the Gunsmith section because I can learn so much by reading others problems and solutions.
Lets see if I get this right,
For those people out there like me learning, Here is a picture of my model 586 yoke with "M"stamp indicating hammer nose mod.
SCSW ed 3 says the models 581 & 581-1 , 586 and 586-1 from 1981 to 1987 were the ones made prior to the subsequent hammer nose modification.
The 1987 581-2, 586-2 forward had the hammer nose and associated parts changed during production.
S&W 581 and 586 models that had the hammer nose retrofitted are identified by this "M" stamp.
Its good to know when looking to buy an older 586/581 so you can check to see if the mod was done.
Does anyone know if S&W will still repair the models covered under the recall?