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Question about stampers


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Hi VC long time no see.


I need to know (for an upcoming book I've written: On Earth As It Is In Hell),

are the center holes of stampers fitted with some lock,

that if you remove a stamper from a press, and then put it back in, would it be at the very same degree of rotation to which it was in the first time?

For example, if you press 100 records with a set of stampers, take them out, then put them back in for a second press, would the alignment between a-side and b-side be the same in the second press as in the first press, or would be a random degree of alignment?

 

I've been looking at photos of stampers and haven't seen anything that locks them in place.

 

But here there is clearly a lock made in the formation process:


And then here's a crimping machine:

Thanks,

Michael

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