This video explains the function of the actuator, and how to troubleshoot common problems. Each crucible has it's own actuator assembly on all versions of the Steampunk. They are basically the same in Above Bar SP versions and the MOD versions. Typically, if the machine has not been used in quite some time, manually spreading the grease in the shaft will help to loosen up the actuator assembly. If you are noticing that the actuator is sticking or slow, refer to this video for troubleshooting information.