Wingshooter, I use a burnisher I inherited. It is hardened steel, but it has longitudinal grooves. Works good for turning the curl.
Those curls were from a solid walnut newel post I was repairing.
Apologies for the misdirection.

That 870 stock was hard to make.
It could use some skip line checkering though.

The newel post.


Out there doing it best I can.