It is all not that simpel , you want the inside to be Tough , and the outside hardenned for Wear. But if you heat them just up , and then quench them , they wil deform .
same with track links don`t heat them up cherry hot to get pins out , the links will also change their charackteristics , and wear quicker.
I pressed them one by one out . Had a lot of NOS pins and several failed after some miles , because of the aging of the material . same problem with brake shoe springs they just snap because they get to brittle from aging.
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