Prop balancer (BoomBox edition)

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Update 16.09.2017 - (regarding the balancing rod)
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I was looking for a better solution for the balancing rod, it seemed that a simple threaded m4 rod wasn't quite doing the job.

After reading a bit about magnetic balancers it seems that the "lesser" friction of such devices might cause a harder time to actually balance your props.

Here is what I did:

I went to our local hardware store and bought a hardened 4mm rod, I then ground and sharpened each end, and made them spikey. (Updated pictures will follow)

I then realized that the rod itself started to get a magnetic polarization, I then figured out the "middle" position and marked it.

The way of balancing my props looks like this:

Attach the prop to the rod in a way such that the prop is horizontally aligned to the polarization of the rod, then try to balance.

Due t