Missing or warped windows are a common issue with aging view-masters. Fortunately these are easy to replace with the right tools and instructions.
If you need help dissembling certain models view these links.
Model G Plastic 1959-1977
Model C Bakelite 1946-1955
Not only are these windows warped but they're covered in dirt. After removing the windows I rinsed them in soapy warm water and gave a final coat of Novus polish. They looked better afterwards but the warping was not fixed.
I'm still searching for the perfect window replacement material. The original plastic was frosted and diffused and most commonly found plastics are crystal clear. In the meantime I will compromise until a better solution is discovered. If you have any ideas please share!
|Trace and Cut|
Currently I'm using plastic from "top loaders" these are low cost trading card protectors found in hobby shops. Nearly all top loaders are made from archival plastic, which is a big plus. One top loader can repair 3 viewfinders.
Since the replacement is not frosted I prefer using the new and original parts simultaneously. The thickness change is less than 1mm and doesn't affect the Model G View-Masters. On the Bakelite Model C only one panel can be placed in the holder.
|Original window laid first then followed by the new piece.|