Hi John, happy to see that...

If you connect it to a receiver, and put the channel midstick (any random channel, as long as it is set for full servo travel) you should hear silence in the end positions, and a soft rattle over nearly the entire stick-movement. Then you know the solenoid works.

When you push the solenoid in its housing, make sure that the ridge on the solenoid touches the metal housing (sometimes it requires a strong push. A tiny bit of vaseline befor inserting helps).

When inserted, if you connect a piec of tubing to either of the connections, and insert the set to the receiver, blow gently into the tubing, while operating the stick, and you can determine which side is open and which side is closed.

If you use a liquid (preferably fuel), you should see something like this: