Good Question Rich...
The Swiss eliminated any and all machining operations and features that were unnecessary to proper functioning in their later models... Why these tabs existed in the first place would take some study of the movement of the toggle and slide... Off the top of my head... I haven't got a clue.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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