Another option is to use the switch on the back of the actuator to fix the position of both valves. The suction valve should be set for mostly pool suction and a little spa suction while the return valve is mostly spa return and a little pool return. It will appear as though the pool is in spillover all the time but in reality, both spa and pool have water flowing through all the pipes.
With this solution, you won't have take apart the actuator and when temps rise, you just put the actuator switches in their normal positions.
