Cactus / Seedling grafting

It is impossible to inport plants in here and is very difficult inport seeds either. There was only one cactus seeds supplier in here but he finished his business.
I collect cactus seeds from myown plants and sow around 30 species every year. Normal cactus grows very slowly and I graft very young seedlings to accelerate the growing speed.
The attache photo is Ariocarpus hybrid kotschoubeyanus x scaphirostris, sown seeds on 25/11/10. I grafted 20 days old seedlings.