I have posted these pix in my build blog, but I hope that they can be helpfull here.

Having pinned the entire hull using a pair of long nose pliers, and bending countless pins in the process, I was concerned that while pinning the chainwales the pins will rotate in the pliers jaws and mark the finished hull.
I finally thought of doing this modification to my long nose.
I cut a slot into both jaws of an "old" long nose pliers to accommodate the pin head, and filed a grove down the middle. No more twisting/rotating pins - wish I had thought of this earlier!!!
Since posting that, I have learned that model railroad suppliers sell the exact pliers - with slots milled in - for pinning tracks.

I have found that I have much more control of the pin than using the conventional pinning tools.

Kind regards,

Garth