If possible, my first check would be to measure the distance from the bottom of the slot to the edge of the chip breaker and compare this with another chip breaker of the same size.
There is a chart of such measurements here on SMC, but it only covers Stanley chip breakers.
Maybe some one can supply the measurements from one of their chip breakers if you do not have another LN plane using the same sized blade.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
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