I didn’t know Dee had asked about a rolling pin, I would think he would repair his own since he is an experienced turner.
most of the heirloom rollers do not have any metal, that is a modern innovation.
as you can see in the first photo of Debra’s rolling pin the handle pin was broken off and the stubb had to be drilled out. They are usually not glued so once most of the material is gone the rest comes out of the hole intact.
the longer part of the original pin, the part that shows, has to be turned down to fit an extension. The extension is then turned, drilled, and glued together with the original part.
the repaired pin is then measured and cut to exact length. Then the handle is replaced with the repaired pin. If all is done correctly the rolling pin looks and works just as it always did.
no part of the repair is visible.
this seems like a very simple repair and it is, but every step holds opportunity for destruction and each operation has to be performed within a few thousandths of an inch with precise alignment.