Refit Heatsink Tool for Nut Tinning The screw tinning tool is used to tin the screws of the upgrade heat sink to help complete the replacement operation of the upgrade heat sink, the size is 7*7 cm. Replacing the refit heat sink for the hash board of the Antminer 17 series can help restore the stability of the Antminer 17 series and reduce maintenance costs and time. The most standard operating procedure for replacing the one-piece heat sink needs to be applied to the screw tin tool, which can quickly complete the tinning of the nut, and then fix the heat sink to the hash board.