I have Just completed a perfect clone from a Jammed Spindle 4TB Toshiba Hard drive
Model: MD04ACA400

I used V2 of my BaseReplace Tool modifying two holes so that is would sit correctly
The heads were also removed prior to using the tool
I have attached a template that you can use as a guide to make this modification to your existing V2 Basereplace

Note
the spindle motor on the donor Base had a balancing plug that could not be seen until platters were removed
as the Original did not, I chose to remove it