How to make Vibratory Tumbler Machine With Fan (Rust Removal)

DIY : I built a parts tumbler that vibrates to remove rust from bolts and nuts. These are the ones that other Youtubers have introduced and I have made changes to make them easier to make. The vibrating type rotates the sand well, and from the looks of it, it seemed to work better than a barrel grinder. However, they are not as effective as tumbler machines should be, and I suspect that others are making false videos. It's a shame because professional vibrating tumblers cost hundreds of dollars and I tried my best to make a DIY version that would be easy to make. Perhaps it was necessary to run the tumbler grinder for an extended period of time.