Hamshack Sunday. First use of an old War key. Bendix Morse code key

I don't know a great deal about this old key. It was given to me a few years ago and never worked. Turns out all that was wrong were dirty contacts. I believe the key dates from WW2 and was an American service key. It has a flame proof design to make it safe to use in environments that could have contained fuel vapour etc. The contacts being sealed will not be a source of ignition.