I went to my local hardware store and bought fifteen 1” diameter washers. I super glued them together and using velcro I attached them to the main counter weight. It doesn’t look great but it’ll work until moment (or 3rd party) releases a proper counter weight. It’s perfectly balanced and I can’t say enough good things about the moment wide angle lens.

I did confirm with Moment that they’re working on a counter weight for the OM2.

I've got wide Moment lens and also created DIY counterweight for left arm. Don't forget to balance also tilt because lens is very heavy and pushes phone forward.
The only current drawback is that I see Osmo arm inside frame sligthly