Technician reported an air turn back after engine maintenance when it was determined that the propeller control cable was disconnected from the propeller control and not reinstalled prior to flight.

Narrative

I was notified that Aircraft X's left hand prop cable was found detached from prop governor after an attempted flight. Previously; I was involved in performing a engine vibration isolation mount change on the left hand engine of Aircraft X. In the process of mount replacement we are required to hook up a engine hoist to relieve weight on the mounts. During the process of hooking up the hoist we removed the the prop cable from the prop governor to provide clearance at the forward hoist bar attach point. Normally the removal of the cable from the prop governor is not necessary to complete this task; but in this instance we were using a engine hoist bar with less clearance than normal due to the normally used hoist bar being used on the other engine at the time. at the end of the day; after finishing the mount installation; I personally do not recall reattaching the prop cable to the prop governor. I also do not recall any communication with the other mechanics involved in the task as to weather or not someone had reattached the cable. A logbook entry should have been made for the removal of the prop cable. We could work on having better communication among mechanics. We could buy actual PT-6 engine hoist bars instead of using ones made in-house.