Five grams is the touch used, about the weight of a nickel.
In 📝Craniosacral Therapy that dose is the method. Heavier is a different modality. The number is a teaching image, not a scale on the table, and not a claim that five grams has a proven physiological effect. If the receiver feels pressure, the contact is already too much.
Clients often wonder whether anything is happening. The work is listening, not leaning. Sharp, dizzy, or panicky sensation is a stop.