How hard should I press the durometer (shore O) on the sponge?

[Robin0910]

I’ve just tried it on a boosted commercial H3 38 Neo and when I pressed it normally it was around 52-53 but when pressed harder it almost went up to 60. So how hard should I press it?

 

[Kopp]

Push until the presser foot makes firm contact with the sponge. Just as you would push your finger into freshly baked bread from the oven.