Here are some pictures of my magnetic prop balancer!
I just upgraded it with much more powerful magnets.
Note the dowel spacer at the bottom. it has a screw on one end which allows me to spread the arms.
The spinner touches the magnet on one side and the spacer adjusts so there is a 1/8" gap on the other end.
Very little friction...

Works great it shows this prop has one heavy blade..

I found these magnets inside a computer hard drive. Trashing some old PCs at work. These two magnets control the read write heads.

Doesnt look pretty but cost about $4 for the manual prop balancer which is meant to use between your thumbs but I found there was to much friction...


Steve