How to get a?
To create new hammers, you will have to create a new workbench, in which the hammers themselves will already be created.
When you have created a modified workbench, you can start creating individual parts of the hammer, there are 2 of them.
After obtaining a mining hammer, you can improve it by surrounding it with redstone blocks, as in the picture below.
IMPORTANT!!! For the mod to work, enable some of the experimental mode functions in the world settings, as in the picture below.