Interesting build to convert a drillpress into an Oscillating sander

I have seen folks make sanding drums for drillpresses in the past, this is the first time I have seen a build where the author uses the motor to also drive the quill up and down. Pretty clever build overall.

https://www.homemadetools.net/forum/oscillating-drum-spindle-sander-my-old-drill-press-82635?homelistings#post170505