[Dominik]

Hi David!

The taper on the exisiting pins are not machined, rather hammered on in a die. Probably the same time the internal hex is done.
That's why the taper is off, wrong angle, and not concentric. The thread is probably also chased in that die.

Please measure if the thread is concentric, or just let the Trigo pin run on a 1/2" stud in a drill press.

Let's measure adapters, and if they are NOT 90 deg, offer pin in 90 deg nevertheless.
People could taper them on a drill press using a standard 90 deg taper.

Of course, if we can confirm that they (and Superformance) share all the same angle, you could offer the pins drive nuts in that angle.

Dom