Cactus / kotschoubeyanus

It is hard to make a lump of body from seedlings of Ariocarpus kotschoubeyanus but it is possible to make by grafting.
I grafted a very young seedling of kotschoubeyanus Rio Verde in 2004 onto a Hylocereus stock.
I degrafted the scion with a short vascular bandle of the Hylocereus in 2005.
As shown on the attached photo, the cactus has been a good lump of body, 12 cm diameter.