Cactus / seedling grafting

I lost several good mature plants, Astrophytum myriostigma cultivars lately. I have to rebuild numbers again.
Several 1 year old seedlings were remained and I grafted 4 days ago.
When you graft very young seedling 10~30 day old after germination, you do not need any pressure onto the scion but you need some pressure to compensate body shrinkage when the seedling was older.

I used a small piece of pantyhose to give pressure onto the scion before but I tried  a plastic lapping sheet this time. You can see the condition of the scion easily when you used a plastic sheet.
The scion is Astrophytum myriostigma v nudum cv khoyo, kikkou.