Hi Paf et al
Bench pins have 2 sides. The flat side is used for piercing and the
slanted side is used by jewellery mechanics.
The slant makes it easier to file, so they say.
Personally this video, although interesting, does not produce the
highest quality ring holder.
Saying this, I used wooden/plastic bench pins for years.
Till I bought a BENCHMATE, with the setters pack, about 5 years ago.
The setters pack allows you to clamp rings from the inside, which is
especially good for wide bands.
Being able to pivot/swivel the ring clamp is also very useful.
One modification I made was to glue a rubber bench pin to the T
section Shellac pad. I use this for filing.
Here is a video link
The Benchmate is worth every cent in increased quality and time
When my daughter came back to the bench after having a child, I had
bought her a Benchmate.
She could not believe the difference.
Not affiliated with GRS, just a satisfied customer.