I use from my plane days a Dubro Tru-Spin Prop balancer. They are $$ but in today’s world I am sure there is a knockoff on Amazon for less $.
I am a cheap bastard so I hoard stuff and the shaft is a fiberglass tent pole I had from the 90’s that is a perfect 8mm OD for the Hex that was from the RC project in 2015.
The Dubro is not wide enough for a 1/5 combo so I bought a cutting board from the $99 store for $1.07. Tapped ¼-20 holes for the uprights and works as it should. You breath on the tire and it moves in true Dubro sensitive fashion. Balance as you would with my preference being model clay.

I am a cheap bastard so I hoard stuff and the shaft is a fiberglass tent pole I had from the 90’s that is a perfect 8mm OD for the Hex that was from the RC project in 2015.
The Dubro is not wide enough for a 1/5 combo so I bought a cutting board from the $99 store for $1.07. Tapped ¼-20 holes for the uprights and works as it should. You breath on the tire and it moves in true Dubro sensitive fashion. Balance as you would with my preference being model clay.
