Review on 🔥 Heat-Set Insert Installation guide for Weller ST Series SP40NKUS Tips and Hakko FX-888D - Ideal for #4-40, M3, M4, and M5 Inserts when Joining 3D Printed Components. by David Nelson

Whilst a regular soldering iron tip will likely work almost as well, with these specialty tips you no longer have to worry about solder getting on all of your bits and you have a bit more control pushing straight through with a whole extra one Iron to install these insert-only tips as it's easier to change the entire iron than to constantly unscrew the tips and risk damaging the cartridge heater. (a problem I know firsthand). It's also easier to just plug another iron into the station without having to wait for it to cool down before switching attachments. It's not necessary, but they make life a little easier if you do. many deposits.