The PEIN spelling is from the German. I understand it is a feminine
Middle High German Pine, Old High German Pina <medieval Latin pena
<Latin poena = atonement, repentance; Fine; Punishment; Qual <Greek
Also: violent physical, mental discomfort; something that torments
The link dopesn't work, but a sinking hammer is a specialized metal
forming hammer used to form details in sheet metal -usually used with
a form behind the metal, sinking the mdetal into the form for ribs,
etc. I've used them numerous times.
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