I tested the new units with a battery and they work. The old smoke motor would still run when I took it out of the tank, it just wouldn't smoke.

So between now and then something else has broken so that power will not even go to the smoke unit plug.

Thus ends my Hen Long experience, can't say it's been pleasant.

This tank will meet a violent end.

I have neither the time nor the inclination to continue trying to modify this tank into what I paid for.