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The Video does a good job showing how to remove the filter frame and filter retainer ring.  I was able to remove the filter retainer rings and replace  the filters without removing the filter frames from the sextant body.  It would be better to use proper solar film as shade material rather than what was shown in the video. See link.

https://www.amazon.com/Thousand-Oaks-Optical-Telescopes-Binoculars/dp/B01770FDAC/ref=asc_df_B01770FDAC/?tag=bingshoppinga-20&linkCode=df0&hvadid=&hvpos=&hvnetw=o&hvrand=&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=&hvtargid=pla-4584276300029050&psc=1

Greg Rudzinski