Sometimes an idea is so simple, that you have to share it.
I tried different propbalancers over hte years, but was never satisfied. After some reading on the internet, I put some ideas together.
Start with the following: 2 simple steel book supports (few bucks new, or $1 used)
Four neodymium / rare earth magnets ($3 for 10 magnets; the other ones you can use in canopy's)
Simplest prop balancer ($1,50 HK)
Put 2 magnets on either book support.
Put something heavy (like books) on the book supports.
Put the prop balancer between the magnets.
Push the book supports futher away from each other, so the prop balancer only touches one set of magnets.
I'm not gonna tell you how to balance a prop. There are a lot of goods how-to's.
To prove my point that this thing rocks: a video of a "perfectly balanced" prop, that was balanced on a $11 balancer from HK