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Likely Phillips #1 maybe #2. You could replace with socket head if not with Bob’s knobs. Some users report stripping the Phillips and prefer socket head screws but you will then have to match the thread, pitch and length. Not sure if it makes collimation any more or less sensitive.
Phillips #0, #1, #2, #3, #4, #5 are useful for many other applications. You can get shorter or longer handle versions. Note there are also Pozidriv that looks like Phillips. Search online for images and you’ll see the difference.
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