I intend to swap out a FT prism with failed foam degradation. What might be a good replacement. The foam used to secure the prism block must have had improvements in the last 47 years. Anyone know?
Mine is right along the top peak of the prism, and I don't intend to fix it as it gives me a nice vertical reference line. I would think that foam you can get from Jon Goodman would work fine.
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