I stupidly broke the plastic "lever" off the top of an ACL Lifestyle
679H308 30LI 2-port motorized valve.

This controls whether the valve is permanently open, permanently
closed or controlled by the CH controller. I can move the "stub" left
with difficulty and I searched and searched among the dust and grime
around the tank but I can't find the broken lug.

It's a long shot but does anyone know who is the current supplier of
parts for these valves? I have googled but I'm guessing it is highly
unlikely I can replace this "lever"

Thanks

Clive