TACK HAMMER • DICTIONARY ONE.COM • Definition of Tack hammer

... leather, and to do this we drilled a hole of the diameter of the rivet in a block of wood, and putting this block over the washer, with the end of the rivet projecting into the hole, we hammered the block until the washer was forced down tight against the leather. Then taking a light tack hammer we battered down the end of the rivet onto the washer. Care was taken to do this hammering very lightly, otherwise the end would have been bent ...

— The Scientific American Boy - The Camp at Willow Clump Island • A. Russell Bond