A common aftermarket fix for sticking primary weights is to install a spring inside the governor body of Chrysler A404, A413, A470 and A670 units. This approach often fails because the spring jams in the bore. Sonnax governor bracket and spring kit 32204-03K is designed so the spring is outside the governor body, safely returning the governor valve to the at-rest position at stops.
If the weight has a through bore, use the 9-coil light spring, not the 6-coil heavy spring. It is recommended to use a PTFE seal ring since cast-iron rings can contaminate the governor.