Chain tool

[Harvy]

Hmm, do I put my centre punch in the counterbore, and belt it, so that it locks onto the I'D of the side plates?

Take a look at the rest of the chain to see how far the side plate is pressed on........you should see a gap between the inner and out plates..... try to emulate it.
Yes, you don't need to to punch it thru into the next century - just a couple of sharp taps with a centre punch will spread the pin sufficiently so as to lock the side plate in place.

Harvy