Same model but narrower slot for BrownCastle Board

Identical to original, but the slot for attaching to the board has been narrowed from 0.25" down to 1.8 mm to fit the BrownCastle board.  
 

As with original, some buttons/discs are slightly larger that others.  So scale this model up a few percentages (~3-5%) if needed to fit the discs.