Placing The Clamps
Here, as is most of this blog, I'm talking about male nipples, and this topic might be different with female ones.
It is possible to place clover clamps in a normal position, so that part of the nipple still protrudes. Also you can move the clamp away from the centre of the nipple, so that nothing protrudes, or even so that the whole clamp is not on the nipple - I call this 'edge' clamping, and it is more intense. 2mm either way, and the effect changes - but be careful of the clamp slipping off!
I've put some sketches in my 'Nipple Clamp Experiments' album.