Here are the parts necessary to build an extension cord for the Sony HVL-F32X flash. You can get the parts from mouser.com
[Disclaimer: I am not an employee or in any way affiliated with mouser.com. I am just a satisfied customer.]
The part numbers are:
- 161-6425: 2.5 mm 4 conductor jack
- 172-7425: 2.5 mm 4 conductor plug and 6' cord
Optionally, you can get 172-7426, which is the same as the 172-7425 but with a 90 degree angled plug.