9.2.2 Still nolding the specimen end with a thumbnail, open the jaws of a plastic press with the other hand. Insert the holder with the specimen between the long and short jaws,releasing the thumbnail when bringing the end edge of the long jaw into contact with the specimen.The 18 mm mark on the metal holder, the unfolged end of the specimen, and the end edge of the plastic prss are to be aligned before releasing the specimen. A fold should be formed 1.5 mm from the end of the short be in firm contact with the folded specimen but should not be squeezed.