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Old December 4, 2012, 08:11 AM   #10
Senior Member
Join Date: November 8, 2007
Posts: 1,997
The "plastic grooves" on my scale also move SLIGHTLY. That has never been a problem for me. I suspect (but don't really know) that it was designed that way so that the "grooves" can align with the knife edges on either side of the beam. Any misalignment might cause unreliable measurements.

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