Molex 0640011000 obsolete crimp tool replacement
The recommended replacement offered by Molex is 640010400, Digi-Key part number WM1622-ND
https://www.digikey.com/en/products/detail/molex/0640010400/670085?s=N4IgTCBcDaIGwBYAMSCMTlJAXQL5A
Molex web site