I am looking into getting counterweights for my Osmo mobile 3 and was wondering if anyone uses these?

Counterweights

Hello there GGEZ. Thank you for reaching out and for these information you have posted. The socket on the side of the phone holder on the DJI Osmo Mobile 3 is a counterweight port for balance adjustment when using other third-party accessories ( such as external lens ) and I hope that you will get the best information from our fellow DJI Members who uses the said Counterweights on there DJI Osmo Mobile 3. Thank you.

They are much cheaper on eBay.

Not tried them myself

i am using , because without them my video is shaking and doing some waves. im using  Ulanzi DH-04 Universal Gimbal Counterweights . So i can but it in the side port, and same time i can put some behind the gimbal , to help him hold my phone which is to heavy for him.