In an earlier contribution to this discussion,
wrote:


Does anyone know anything about these MA1 actuators? There is a black
button at the end of the assembly which sticks out on the old (broken)
actuator, but is pushed in on the new one. Does this have to be
released in order for the actuator to run freely between its three
positions? I gently tried to turn the actuator by using a screwdriver
in the valve hole, but it is stuck.

I don't know this particular model - but didn't it come with any paperwork
explaining it's operation?
--
Cheers,
Set Square
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