Replacing my 4 window cranks on my '69. I have the tool I bought years and years ago but I forgot how it works and how do use it to remove the old ones and re-install the new ones.

Any help would be appreciated!

 

The tool slides between the handle and plastic disc, if installed, and continue pushing for pushing out the clip and handle slides off.
For installing new handle, install clip onto handle, and align handle onto crank shaft, and push handle onto shaft. Done.