I've always wanted the dgt chess set used in tournaments by the grandmasters, but i couldn't afford it, so i decided to design my own trying to be as close as possible to the original one.

The pieces are weighted with a:

 M10 hex nut (16.8mm flat side to flat side,  7.8mm height) for the pawns

M12 hex nut (18.8mm flat side to flat side,  1cm height) for the rest of the pieces

that can  fit on the bottom, without any glue but some amount of force.  I've found that placing the nut on a flat surface and than press the piece on top it's quite easy.

I've later added some green felt to make them look more professional.