Cactus / Degrafting of Ariocarpus

Winter in here is relatively mild.
Pereskiopsis can grow in winter in my greenhouse.
They can keep leaves 1st winter when they were used as grafting stocks but loosing leaves during 2nd winter.
The growing speed of scions will be dramatically reduced when stocks lost leaves.
I degraft scions when they are 2 years of old because of the reason.
The photo is 2 years old Ariocarpus retusus v furfuraceus cv Sugri cauliflowers with short Pereskiopsis stocks, 10 mm length.
Potting medium is pumice sand. I completed defrafting and potting in this morning.
Pots are 10 cm square pot.