Ring Fast On The Finger. When this occurs, the use of cold water to the finger and hand - the hand and arm being elevated at the same time - may cause sufficient shrinking to permit of the removal; if this does not succeed, the following may. A piece of fine pack thread, or linen thread is to be wrapped evenly and firmly round the finger, from the tip as far as the ring, through which the end is to be inserted, which being done, the pack thread must be gradually unwound by means of the end thus placed. If this process does not succeed the ring must be filed off; it cannot remain without risk.