The result of your conversion between jigger and pony appears here
To convert between Jigger and Pony you have to do the following:
First divide ((0.000016387064*231)/128)*1.5 / (0.000016387064*231)/128 = 1.5
Then multiply the amount of Jigger you want to convert to Pony, use the chart below to guide you.
Symbol: jigger
No description
Symbol: pony
No description