As you press, you'll have to balance the weight plate on your palm using finger pressure. (hardgainermusclebuilding.com)
It should flow with only the slightest of finger pressure. (2ndchance.info)
Do not apply any kind of pressure (even finger pressure) to the back of a canvas — cracks in the paint will likely develop after a time if this is done. (sarinadiakos.com)