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It will work fine until it cracks at which point it's too late if you happen to be looking through at the time. I had one crack on a 60mm f11 achromatic a very long time ago (pre Internet era and pre warnings on such filters) and thank God I wasn't looking through at the time. Smash it now.
To align the Sun cover any unprotected optics and then look for the smallest shadow your equipment casts when pointing at the Sun.
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