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The threads which secured the ball head locking screw finally wore out, alas, and I haven't been able to find any substitute parts, let alone anyone who can repair such "antique" equipment.Have you looked for a
*skilled* "
just plain" machinist who may be able to ream out the old hole, re-tap the resultant smooth hole, and provide a screw to fit?
Years ago, I took my daughter into the nearest optometrist's shop when she needed a new screw for her glasses - as with your tripod, the original threads had worn out - expecting nothing more than a longer, thinner screw with a nut to hold it in place, and was amazed when the proprietor did just that.
OK, he was an elderly, obviously old-school European immigrant, and competence such as his may be hard to find, but it still exists.
