Prop Balancer

I ordered a balancer without any stand, so I went to my garage and found parts to model around. I used these 9x2mm magnets: https://www.fasttech.com/p/1140103 and made the space for the magnet to be glued into 10mm in diameter and 2mm deep. The nut and bolt was just something random I found in the garage and I don't know like the actual name for them (like M3, M4, M5) but from flat to flat on the nut is 8.65mm and the bolt is 4mm thick, I made the spot for the nut again 10mm and 3mm deep with