I made handmade pierced earrings and pin batches, but there were times when the metal fittings that became the shaft bent when packing was shipped. Therefore, I will purchase this sheet and try using it as if pointing to cork at packing. The hardness is a feeling that it compressed the styrofoam tightly, I feel that the strength enough to not bend through the needle tip is enough. I will use it for a while and try to purchase a slightly larger one for the next purchase.
I enclosed the vacuum pump with 5 polyethylene foams. I fixed it in an L shape with adhesive and wood screw, and devised it into a box shape by combining it. When changing the oil of the vacuum pump, we are making it easy to remove.