Mortise Lock Anti-Slam Button

A home owner from El Cajon, CA says:
The external tab on my anti-slam button (A-shaped internal metal part within the mortise lock assembly) has sheared off. Can I purchase the anti-slam button part separately or do I have to purchase an entire 82-238 mortise lock assembly?
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Mike from SWISCO responded:
You will have to purchase the entire Double Hook Mortise Lock, as we do not sell any of the other parts separately.
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