My Leitz Pradovit Colorplan 250 Autofocus projector all too often will not pull a slide from the tray into the projector, requiring me to return to the projector and push the mechanism and slide a few millimeters before the machine pulls the slide in. Typically this will happen repeatedly. I've looked at the trays and the "slide transport arm" (No. 9 in the photo), and I'm tempted to take a file and start modifying the latter. But I know it's probably just an adjustment - somewhere. The original instruction booklet does not address the issue.
Has anyone prior similar experience who can advise me, or point me to a webpage or video with troubleshooting advice for this projector? I've been unable to find the solution through searching the internet.
Thanks in advance for your help!