How to grow Astrophytum myriostigma “Huboki” from cuttings

Common name(s): Bishop’s Cap
Family: Cactaceae
Stem cuttings: yes
Leaf cuttings: no
Root cuttings/runners: no
Time: the year round
Lighting: bright to sunny
Soil: bird sand, clay granules
Temperature: 20 to 30 °C
New growth after: first roots appear after 3 to 5 months
More infos: let the ends of the cuttings dry for 2 to 4 days.
Let them root in bird sand and after 6 to 12 month repot into clay granules.