Using a heavy duty hobby knife to cut off the old bases. 
New bases will be 25mm washers
The base building materials: cork granules, mix of modelling sand and acrylic sand paste
Testing out the layout with cork granules. 
The acrylic paste. 
Applying with spatula, blending in the cork rocks
First batch of 10 doneSupported by (Turn Off)
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I’m assuming you didn’t fill the hole in the washer first, just tape on the bottom and then using the paste to fill it in? Good job, I like the old Antenocitis’ cork as well.
Exactly, piece of masking tape to block the bottom and then the paste on.
Noooooooooo!!!! The beautiful square bases……. ?