Hello HB members this is my first post here and hopefully it isn't a repeat.
I purchased an HG-1 this past April and I'm really impressed with it... anyhow following the instructions to find the "zero point" and actually finding it by feel seemed a little vague so I used an ohm meter across the burrs to establish zero, simple and effective.
Give it a try and see how it corresponds to your "zero"

The zero point is only an indicator to get in the ball park for proprer grind setting on the first use when following initial setup instructions.

I don't know why people attach such an importance on that number or calibration. I don't care if I start the dial in with the number 4, 2 or 8 on the burr collar. The burrs alignment, the endplay of the shaft and the lash in the gearbox is something I care.

Why not have zero be zero?

The zero point is where the burrs touch themselves. How this data can help you dial a shot ? It's worthless.

The zero point is to help people dial a shot when the grinder is out of the box. The instructions are clear: zero point, back up 1-1/4 turn on the adjusting ring: should be in the ball park and only minor adjustments should be necessary to achieve an espresso grind.

If your burrs touch themselves at the number 0 or at the number 5, the 1-1/4 travel on the adjusting ring still produce the same travel on the burrs (calculated in mm...) and you will get the same results.

How would one use an Ohm meter on grinder burrs? Can you post a video for educational purposes?

Set your multimeter to Ω (even better if your meter has an audible indicator) attach/hold one lead from the meter to the shaft or upper burr and the other lead on the lower burr, turn collar CCW until there is continuity/zero ohms of resistance this is the point where the burrs make contact and will be exactly zero setting.