Acorn Spring Swage
Should be used hands-free...see https://www.blacksmithsdepot.com/products/spring-swages/add-on-hardy-shanks.html
*****The dies of these spring swages are drop forged S7 tool steel. The clapper dies are heat treated after forging and than welded to a mild steel spring. The weld wire is a high tensil strength wire designed for use with dissimilar materials. However the weld is also the stress point. Due to the likelihood that each blow will not be even, the weld will eventual fracture. It is for this reason that we can only replace these if the dies themselves fail and and for reasonable amount of time and use.
DO NOT USE Hands to hold under a power hammer.
Create an Acorn on the end of your bar stock quickly with this spring swage
Off-Center Products - Drop forged in the USA
Heat Treated S7 dies
Mild Steel spring