diff --git a/gtsam/linear/linear.i b/gtsam/linear/linear.i
index 640a1a1a41..2bf55bba10 100644
--- a/gtsam/linear/linear.i
+++ b/gtsam/linear/linear.i
@@ -127,6 +127,7 @@ virtual class Huber: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class Cauchy: gtsam::noiseModel::mEstimator::Base {
+  Cauchy(double k);
   Cauchy(double k, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::Cauchy* Create(double k);
 
@@ -138,6 +139,7 @@ virtual class Cauchy: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class Tukey: gtsam::noiseModel::mEstimator::Base {
+  Tukey(double k);
   Tukey(double k, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::Tukey* Create(double k);
 
@@ -149,6 +151,7 @@ virtual class Tukey: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class Welsch: gtsam::noiseModel::mEstimator::Base {
+  Welsch(double k);
   Welsch(double k, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::Welsch* Create(double k);
 
@@ -160,6 +163,7 @@ virtual class Welsch: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class GemanMcClure: gtsam::noiseModel::mEstimator::Base {
+  GemanMcClure(double c);
   GemanMcClure(double c, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::GemanMcClure* Create(double c);
 
@@ -171,6 +175,7 @@ virtual class GemanMcClure: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class DCS: gtsam::noiseModel::mEstimator::Base {
+  DCS(double c);
   DCS(double c, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::DCS* Create(double c);
 
@@ -182,6 +187,7 @@ virtual class DCS: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class L2WithDeadZone: gtsam::noiseModel::mEstimator::Base {
+  L2WithDeadZone(double k);
   L2WithDeadZone(double k, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::L2WithDeadZone* Create(double k);
 
@@ -193,6 +199,7 @@ virtual class L2WithDeadZone: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class AsymmetricTukey: gtsam::noiseModel::mEstimator::Base {
+  AsymmetricTukey(double k);
   AsymmetricTukey(double k, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::AsymmetricTukey* Create(double k);
 
@@ -204,6 +211,7 @@ virtual class AsymmetricTukey: gtsam::noiseModel::mEstimator::Base {
 };
 
 virtual class AsymmetricCauchy: gtsam::noiseModel::mEstimator::Base {
+  AsymmetricCauchy(double k);
   AsymmetricCauchy(double k, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
   static gtsam::noiseModel::mEstimator::AsymmetricCauchy* Create(double k);
 
@@ -214,17 +222,6 @@ virtual class AsymmetricCauchy: gtsam::noiseModel::mEstimator::Base {
   double loss(double error) const;
 };
 
-virtual class TwoSidedHuberCauchy: gtsam::noiseModel::mEstimator::Base {
-  TwoSidedHuberCauchy(double k, double k_huber, gtsam::noiseModel::mEstimator::Base::ReweightScheme reweight);
-  static gtsam::noiseModel::mEstimator::TwoSidedHuberCauchy* Create(double k);
-
-  // enabling serialization functionality
-  void serializable() const;
-
-  double weight(double error) const;
-  double loss(double error) const;
-};
-
 virtual class Custom: gtsam::noiseModel::mEstimator::Base {
   Custom(gtsam::noiseModel::mEstimator::CustomWeightFunction weight,
          gtsam::noiseModel::mEstimator::CustomLossFunction loss,