9.2 Place the specimen, use-surface uppermost, on the base
plate so that on part of the presser foot is within 20 mm of the
edge of the specimen and so that the specimen cannot move.
When testing textile floor coverings without yarn or flocked
pile, use a guard ring as specified in 5.2.When a textile floor
covering of more than one thickness level or pile construction is
being tested, no part of the circular presser foot shall be within
20 mm of a change of construction.