Thanks, BTI: that was as clear as mud .... er, daylight, I mean.
Laurencen: the solenoid is another good idea, with its own advantages and disadvantages. It's an all or nothing kind of solution; of course; I only have nothing now, so it would be a big improvement. The advantage is the simplicity. Thanks for the suggestion. I'll take a look and see how it could be implemented.
I had been thinking about a piece of rope, myself
Maybe useful for proof of concept
C
Laurencen: the solenoid is another good idea, with its own advantages and disadvantages. It's an all or nothing kind of solution; of course; I only have nothing now, so it would be a big improvement. The advantage is the simplicity. Thanks for the suggestion. I'll take a look and see how it could be implemented.
I had been thinking about a piece of rope, myself
Maybe useful for proof of concept
C