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Stamping Serial Numbers
How the heck to you stamp serial numbers in cast bottom brackets!
It seemed it should be as simple as, put the stamp in place, and whack it with a hammer.
This approach seemed to not do much of anything, so I lined up the punch again and whacked it again... Ok, a little more of an indent, but this approach over an over eventually ended up a stamp that shifted over multiple whacks, and was still not very deep.
For the next try, I heated up the BB with a torch. While this got me a better stamp, it also deformed the BB... No, it was not glowing red when I did this.
- Do I heat or not?
- Is it my punches? They are a set from the hardware store, but not showing any deformation from my attempts so far.
It is seeming harder than it should be, and I suspect I am missing something obvious.
Thanks!
Mike
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