Adjust basic physical parameters

[eidoom]

Current settings may be somewhat unphysical. Consider:

• Mass of balls
• Size of balls
• Size of pins
• Width of barriers

[eidoom]

Some measurements of the physical Galton board:

• Pin diameter: 3.5mm
• Pin spacing (centre to centre):
  • Diagonal: 39mm
  • Horizontal: 38mm
• Bin width: 22mm
• Bin spacing: 5.5mm
• Nozzle narrowest width: 32mm
• Ball diameter: 10mm