[SML] Solenoids

[Nigel Worsley]

Instead of solenoids look at car door lock motors. They have a lot
more pull than solenoids and don't have the big clunk at the end of
the travel. Probably cheaper too.

I did a test on one of these a while back, unloaded it took about 5
milliseconds to go from end to end to end! Adding a 1kg weight slowed
it down to something like 30 milliseconds, still pretty quick. They
need rather a lot of current though, especially once they hit the end
stop and the motor stalls - at least 5A.

Amazon have plenty of listings for them, typically under $5 each
unless you want them in a hurry.

Nigel Worsley