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I think with public or school solar observing you have extra duty of care to ensure nothing goes wrong. To me that means not using a home made filter and not using a truss scope. An 80mm refractor with a commercially made glass filter that is taped onto the scope would be my choice.(or a PST)
You also need to develop a procedure such as having every person look at the front of the scope to ensure the filter is in place before looking through the eyepiece.
I think you need to be over-cautious when introducing others to solar observing, for your own sake as well as theirs.
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