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There are plenty of garage door openers that feature safety beam sensors to prevent this exact occurrence and endanger others or smash objects, but the one I'd recommend is the B750 from Chamberlain (https://www.optimainstitute.com/garage/door-opener.html#1-chamberlain-b750). Aside from the fact that this is one of the top manufacturers for openers, the B750 is a long-term buy (I have mine for 2 years now and it's in top-notch condition although it really gets abused on a daily basis).
It seems to be a clamp of some sorts.
The cartridge likely needs to be changed, use this for guidance https://popular.reviews/whole-house-water-filters-for-well/#How_to_Change_It
Sounds like a neat idea that would resolve a lot of issues, but woefully, it is unrealistic, honestly. Artificially creating new species is easier said than done, the idea is quite revolutionary, but still...
Creamy Butterscotch Martini. To prepare it, you need 1 cup of milk, 1 cup of vodka, ground cinnamon, 1/4 cup maple syrup, 1/2 cup schnapps, and ice.