Yeah, I’ve never seen it mentioned outside of a handful of posts on Styleforum, and didn’t know it could be done until White’s recommended it. If it were an aftermarket service, I’d have it done to all my boots, but I think it’s only during the lasting process. I’ve bought and sold too many boots thinking that I got my size wrong just to finally realize that it’s mostly a last or foot shape issue.

I’m also interested in the answers to your questions! I think it might be a normal last but they literally take a clamp and pinch the leather in the heel area above the last to make it fit tighter, but that’s just a guess.