What retracts can be upgraded to square thread SPINDLE?

All retracts purchased from January 2013. The serial number must start by 13, 14, 15, 16, etc… (the first two digit indicate the manufacturing year)

• What retracts can be upgraded to square thread SPINDLE?

  All retracts purchased from January 2013. The serial number must start by 13, 14, 15, 16, etc… (the first two digit indicate the manufacturing year)