> After a chat with the other principals last night, they suggested I 
> keep
> it simple.

> should be kept as compact as possible. ...

> I've also been told that there are some (slightly important) timing
> specs involved and that pretty much means solenoids

Motorised cams or levers, or  motor controlled drop weights will meet 
the above specs and MAY be simpler than solenoids turn out to be.

I've long ago actually done what you describe for the reasons that you 
are doing it, albeit with only two keys. I used solenoids. It wasn't 
exactly "simple" in the event, but it worked.




        Russell 

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