diff --git a/RavelCAPI b/RavelCAPI
index 909de651e..be1837d64 160000
--- a/RavelCAPI
+++ b/RavelCAPI
@@ -1 +1 @@
-Subproject commit 909de651ee9d7dc5d99f8926b42b5945b7619d42
+Subproject commit be1837d64c34df8febb425520dd962ee4bee9cbe
diff --git a/model/ravelWrap.cc b/model/ravelWrap.cc
index 3299c1108..75ba49d8e 100644
--- a/model/ravelWrap.cc
+++ b/model/ravelWrap.cc
@@ -593,6 +593,7 @@ namespace minsky
             {
               lockGroup=ravel->lockGroup;
               lockGroup->addRavel(ravelPtr);
+              lockGroup->initialBroadcast();
               return true;
             }
         }
diff --git a/test/testLockGroup.cc b/test/testLockGroup.cc
index 592423c50..ac74fc8f5 100644
--- a/test/testLockGroup.cc
+++ b/test/testLockGroup.cc
@@ -17,9 +17,7 @@
   along with Minsky.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "cairoItems.h"
-#include "ravelWrap.h"
-#include "canvas.h"
+#include "minsky.h"
 #include "minsky_epilogue.h"
 
 #undef True
@@ -34,6 +32,8 @@ namespace
 
 class RavelLockGroupTest : public Canvas, public ::testing::Test
 {
+  Minsky minsky; // provides model and selection
+  LocalMinsky lminsky{minsky};
 public:
   RavelLockGroupTest() : Canvas(make_shared<Group>()) {}
 };
@@ -95,3 +95,41 @@ TEST_F(RavelLockGroupTest, LockGroup)
   EXPECT_TRUE(b->lockGroup==c->lockGroup);
   EXPECT_FALSE(d->lockGroup);
 }
+
+TEST_F(RavelLockGroupTest, JoinLockGroupBroadcast)
+{
+  auto a=make_shared<Ravel>(), b=make_shared<Ravel>();
+  
+  // Add ravels to model so joinLockGroup can find them
+  minsky::minsky().model->addItem(a);
+  minsky::minsky().model->addItem(b);
+  
+  // Create a lock group with ravel a and set some state
+  a->lockGroup.reset(new RavelLockGroup);
+  a->lockGroup->addRavel(a);
+  auto colour=a->lockGroup->colour();
+  
+  // Set calipers on ravel a to have some distinguishable state
+  auto aState=a->getState();
+  ASSERT_FALSE(aState.handleStates.empty());
+  aState.handleStates[0].displayFilterCaliper=true;
+  aState.handleStates[0].minLabel="1991";
+  aState.handleStates[0].maxLabel="1991";
+  a->applyState(aState);
+
+  // Verify ravel b has different state
+  ASSERT_FALSE(b->getState().handleStates.empty());
+  EXPECT_FALSE(b->getState().handleStates[0].displayFilterCaliper);
+  EXPECT_NE("1991",b->getState().handleStates[0].minLabel);
+  EXPECT_NE("1991",b->getState().handleStates[0].maxLabel);
+  
+  // Now have b join the lock group using joinLockGroup method
+  b->joinLockGroup(colour);
+  
+  // Verify both ravels are in the same lock group
+  EXPECT_EQ(a->lockGroup, b->lockGroup);
+  EXPECT_EQ(2, a->lockGroup->ravels().size());
+  
+  // Verify state was broadcast - check if b got a's caliper settings
+  EXPECT_TRUE(b->getState()==aState);
+}