On buses up to 1964 the shaft is spring loaded so you can disengage the wiper arm and swing it into the middle, to open up the windows.
These really are the best available on the market. From Wolfgang International.
To use you simply pully the wiper out and rotate to park against the one eyed duck (available separately). To engage just reverse the process.
For 65-67 you can only use the adaptors that are mounted on the outside, available here
$60.00
Wiper Arm and Blade (silver colour) for splits OEM: 211 955 407 (x1) + 221 955...
$20.00
The One Eyed Duck supports the wipers when Safari windows are opened. Attaches via self...
$1.00
For use on the Doors, these are M8 x 20mm stainless so they wont rust...