The Dygon converters fitted into a special bayonet type mount on the Leicina 8s camera. I don't know of any other camera that used the same mount. Leitz moved on quite quickly to produce Leicina cameras with fitted zoom lenses. That was becoming the norm for 8mm cine at the time. There were two that shared a similar body to the 8s, the 8v and the 8sv. Super8 followed around 1965? So these cameras were soon to be superseded by the new format. I don't know if you have the camera, or only the Dygon? I have an 8s which I have used in the past with good results. Lens quality is excellent. The issue with these cameras tends to be the battery holder. It was designed for an early style of AA battery. The modern ones are too large in diameter, causing damage to the holder. The meter, and auto exposure work fine, but it uses the old Mercury cells, so an equivalent for that is needed. I am not aware of motor problems, but that may be an issue I have not experienced. There is a guy on eBay who sells replacement battery packs which look like they are rechargeable. If the only fault in the camera was a damaged battery holder (for the AA cells), it would be easy to make up a workable replacement, taping 4 cells together and designing a simple method to make the contacts.
Alex.