Un-Golf Ball

I had read of the technique to raise dimples but had not seen a result. Neat. Looks like an un-golf ball.

Wow...You are ukibori master !

That looks cool with the inverted dimples and I immediately thought golf ball before I scrolled down to the title.

Is there a difference in the quality of the bumps between end grain and face grain?

And difficult to sand . . . .

Lionel, this was a lucky first shot. I haven't made enough mistakes to consider myself a master.

Robert, I was surprised to see little difference between end grain and side grain. And I may have subconsciously struck the end grain harder.

All the sanding (to 600 grit) was done before dunking, which was effective in seconds. The "few minutes" was to make sure, and it slightly degraded the luster.

Oddly enough, and unbeknownst to me until today, in the period of about 1890 to 1908, some golf balls had raised projections called "brambles." Thus called because they resembled wild fruit of the English countryside. Then recessed dimples were found to perform better.

Nice ukibori
What is a drift punch?

In contrast to the point of a center punch, a drift punch has a flat working surface. They're usually used to drive a round shaft into, or out of, a bored hole. If a center punch is used there, it tends to flare the end of the shaft, so that progress is impeded.