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Identification of Magnavox Micromatic Model 600 series phono changer

Am in the process of searching for a replacement phono changer unit for a 1966 Magnavox Astrosonic Stereo Console. I need to know the description of Part#76244504 (Series 600 Phono Changer); Pick-Up Mtg Screw. If a replacement is not available; I need to know what type of screw I can use to replace it, i.e. length, type of thread, etc... thanks ahead for any help.