The reason they don't make the entire pin out of the hardened material is to save money. They can just ram a bit of drill rod down each and job done, versus machining and then hardening something.
cledry wrote:The reason they don't make the entire pin out of the hardened material is to save money. They can just ram a bit of drill rod down each and job done, versus machining and then hardening something.
Yup, that's it exactly. Also what femurat said is correct as well, if you have two dissimilar metals making contact with each other in motion the harder one will win out and abrade the softer metal.
I dont have mine apart yet, but i think you guys are saying that one of the drivers is magnetic and one of the key pins has a steel insert. If this is the case i would posit its a form of bump resistor-providing the two are in the same pinstack.