I had thought of that and yes I will go down that path if this other system doesnt work satisfactorily, it will take a bit of setting up though not much room left.How about an alternative to the time delay, which would be a mechanically operated switch to release the solenoid after the hoist has lowered that 50mm distance, (about 2 inches.) It seems that some sort of mechanical switch trigger could be arranged that would be able to release it .And one thing is that if the hoist is stopped and then started again that noisy solenoid will operate every time. So a mechanically operated switch may be a better idea. AND the circuit will be much simpler.