For weight, the advice I got is that below 350g is the safe zone.
I’ve only tried Tenga products with the Handy.
- Tenga Crysta is my go-to. They stay in place very well on the Handy. Leaf is an all-rounder. Ball is more stimulating. Haven’t tried Block.
- Tenga 3D doesn’t stay in place. But using the method in OP fixed that. Polygon is good. Zen is meh. Spiral is jaggy and I don’t like it.
- Tenga Flex is very narrow. I removed the outer case and used it with the OP method. The white one is mild but good.
- Tenga Bobble see this post.