Nick Gartner

Recently purchased this camera on eBay and it’s my first 8mm camera. All seems well once batteries are in, the motor engages and all looks right. However, looking through the viewfinder results in a black picture. Moving the test switch into place activates the red light within the viewfinder but nothing from the lens. Could it be something with the mirrors? Any ideas or suggestions on how to fix this problem would be greatly appreciated, thanks! https://imgur.com/a/DcuO0si