Today i also mada some time to check mine. Just bought it and they didnt work. At least i thought. In my 1940 buick it was just one turn button to open the vacuum and they worked. In the chevy i have a button that screws and a pull button. Checked the inside and all look good. When i now run the engibe and pull on switch it goes quickly to the left and stays there. When i push the switch back it goes back to its starting position. I also live in the Netherlands so will encounter the potential rain. I will take out the motor again.
