wiper pivot seals

I was looking at my wiper shafts....the knob that the wiper arm goes on has the center of the shaft peened to hold it, right?

so therefore, to replace the seal, the end would have to be ground so it can be removed?

i assume this is why you use valve stem seals....because it's more feasible that disassembling the shaft....

mine is out, by the way...i was under the dash looking at stuff and noticed the ease of removing it, so i took it out to look at it better.....
just want to be sure i'm right on how it's assembled