diff --git a/sbp/src/operators/traditional8.rs b/sbp/src/operators/traditional8.rs
index 14d0d18..4b431cd 100644
--- a/sbp/src/operators/traditional8.rs
+++ b/sbp/src/operators/traditional8.rs
@@ -40,6 +40,17 @@ impl SBP8 {
         [2.75587615266177e-02, -8.71295642560637e-02, 5.01135077563584e-02, 7.68229253600969e-02, 4.60181213406519e-02, -7.55873581663580e-01, 0.00000000000000e+00, 8.21713248844682e-01, -2.16615355227872e-01, 4.12600676624518e-02, -3.86813134335486e-03, 0.0],
         [5.84767272160451e-03, -1.08336661209337e-02, -1.42810403117803e-02, 3.50919361287023e-02, -1.22244235731112e-02, 1.19411743193552e-01, -7.51668243727123e-01, 0.00000000000000e+00, 7.92601963555477e-01, -1.98150490888869e-01, 3.77429506454989e-02, -3.53840162301552e-03],
     ]);
+    #[rustfmt::skip]
+    const BLOCKEND_MATRIX: Matrix<Float, 8, 12> = Matrix::new([
+        [0.0035384016230155199,   -0.037742950645498902,   0.19815049088886899,   -0.79260196355547696,   -0.0,   0.75166824372712304,   -0.11941174319355199,   0.012224423573111201,   -0.035091936128702303,   0.0142810403117803,   0.010833666120933699,   -0.0058476727216045096],
+        [-0.0,   0.0038681313433548601,   -0.041260067662451799,   0.21661535522787201,   -0.821713248844682,   -0.0,   0.75587358166357999,   -0.046018121340651898,   -0.076822925360096897,   -0.050113507756358401,   0.087129564256063705,   -0.027558761526617698],
+        [-0.0,   -0.0,   0.0027934857464329702,   -0.029797181295285,   0.094272792663829805,   -0.54587651996612696,   -0.0,   0.205756876210586,   0.39561116774840099,   0.020799982439143602,   -0.22287532317150199,   0.079314719624520302],
+        [-0.0,   -0.0,   -0.0,   0.0086536439119011006,   -0.029896495621603899,   0.102950081118829,   -0.63739245543855805,   -0.0,   0.54336288636530095,   0.085109057027750595,   -0.090998664615454999,   0.01821194725190089],
+        [-0.0,   -0.0,   -0.0,   -0.0,   0.019698131073842998,   0.039447042394264102,   -0.28128521251909999,   -0.124714160903055,   -0.0,   0.055770702144577897,   0.41917213003600801,   -0.128088632226564],
+        [-0.0,   -0.0,   -0.0,   -0.0,   -0.055988255885229599,   0.179720579323281,   -0.10329058280084499,   -0.13643348652854601,   -0.389516189693211,   -0.0,   0.54432974445498405,   -0.038821808870425301],
+        [-0.0,   -0.0,   -0.0,   -0.0,   -0.0071669648308011497,   -0.052726783847581303,   0.18675940343293501,   0.024615176293723499,   -0.49400862680798402,   -0.091851192507295606,   -0.0,   0.43437898826698501],
+        [-0.0,   -0.0,   -0.0,   -0.0,   0.020015058331576099,   0.086285816263333495,   -0.34386522738887298,   -0.0254881486107905,   0.78102816812674902,   0.033893192260150001,   -2.2474124634140402,   1.6955436044319001],
+    ]);
 }
 
 impl SbpOperator1d for SBP8 {
@@ -75,8 +86,10 @@ impl SbpOperator1d for SBP8 {
 }
 
 fn diff_op_row_local(prev: ndarray::ArrayView2<Float>, mut fut: ndarray::ArrayViewMut2<Float>) {
+    /*
     let mut flipmatrix = SBP8::BLOCK_MATRIX;
     flipmatrix *= &-1.0;
+    */
 
     for (p, mut f) in prev
         .axis_iter(ndarray::Axis(0))
@@ -84,7 +97,8 @@ fn diff_op_row_local(prev: ndarray::ArrayView2<Float>, mut fut: ndarray::ArrayVi
     {
         super::diff_op_1d_slice_matrix(
             &SBP8::BLOCK_MATRIX,
-            &flipmatrix,
+            &SBP8::BLOCKEND_MATRIX,
+            //&flipmatrix,
             &SBP8::DIAG_MATRIX,
             super::OperatorType::Normal,
             p.as_slice().unwrap(),
@@ -189,3 +203,14 @@ fn test_trad8() {
         1e-4,
     );
 }
+
+#[test]
+fn block_equality() {
+    let mut flipped_inverted = SBP8::BLOCK_MATRIX.flip();
+    flipped_inverted *= &-1.0;
+
+    assert!(flipped_inverted
+        .iter()
+        .zip(SBP8::BLOCKEND_MATRIX.iter())
+        .all(|(x, y)| (x - y).abs() < 1e-12))
+}