Dan, thanks for posting these. Before I decide to build my spindle I contacted a few ali express dealers and asked for some details about what they sell. Steel grade used on each part, belleville washers and force for opening and clamping, the bearings used etc. They all answered almost the same. "Setel bearings". Like I'm stupid. So I decided to build it myself.
@Mark, I'm not there yet but I'm thinking to cut something like what Dan posted (see pic below) but also use a grease/oil seal. I'd like to take some recommendation here tho.