Use this suction cup with a long neck and gripper nubs in a drilled hole of the correct size.
We have supplied these suction cups for drilled holes in 3mm foamex board posters as a cheaper alternative to the usual suction cup with screw and nut or thumb screw. This suction cup is also used in a drilled hole for a firmer grip.
Each 47mm Adams suction cup has a weight loading of 3 pounds (1.36kgs).