diff --git a/build_linux64/libamsstring4.linux64.a b/build_linux64/libamsstring4.linux64.a
index d595bd8..259b44d 100644
Binary files a/build_linux64/libamsstring4.linux64.a and b/build_linux64/libamsstring4.linux64.a differ
diff --git a/build_linux64/objstore/amsstring4_tests1.o b/build_linux64/objstore/amsstring4_tests1.o
index 4e49689..0989610 100644
Binary files a/build_linux64/objstore/amsstring4_tests1.o and b/build_linux64/objstore/amsstring4_tests1.o differ
diff --git a/build_linux64/tests b/build_linux64/tests
index 4c48fac..68fc482 100644
Binary files a/build_linux64/tests and b/build_linux64/tests differ
diff --git a/ref/0p375_hexbolt.scad b/ref/0p375_hexbolt.scad
new file mode 100644
index 0000000..c9636fc
--- /dev/null
+++ b/ref/0p375_hexbolt.scad
@@ -0,0 +1,28 @@
+
+use <threads1.scad>
+
+
+module acmehexbolt_0p375(L)
+{
+    
+Lh = 0.25;
+Dh = 0.75;
+Dth = 0.375;
+Lth = L-Lh-0.125;
+
+union()
+{
+    translate([0,0,0])
+    {
+        cylinder(d=Dh,h=Lh,$fn=6);
+    }
+    translate([0,0,Lh-0.125])
+    {
+        thread_10tpi(Dth,Lth);
+    }
+}
+
+}
+
+
+acmehexbolt_0p375(4);
\ No newline at end of file
diff --git a/ref/testrewrite.scad b/ref/testrewrite.scad
new file mode 100644
index 0000000..c9636fc
--- /dev/null
+++ b/ref/testrewrite.scad
@@ -0,0 +1,28 @@
+
+use <threads1.scad>
+
+
+module acmehexbolt_0p375(L)
+{
+    
+Lh = 0.25;
+Dh = 0.75;
+Dth = 0.375;
+Lth = L-Lh-0.125;
+
+union()
+{
+    translate([0,0,0])
+    {
+        cylinder(d=Dh,h=Lh,$fn=6);
+    }
+    translate([0,0,Lh-0.125])
+    {
+        thread_10tpi(Dth,Lth);
+    }
+}
+
+}
+
+
+acmehexbolt_0p375(4);
\ No newline at end of file
diff --git a/src/amsstring4/amsstring4_tests1.cpp b/src/amsstring4/amsstring4_tests1.cpp
index d95cdf3..e399ea9 100644
--- a/src/amsstring4/amsstring4_tests1.cpp
+++ b/src/amsstring4/amsstring4_tests1.cpp
@@ -427,8 +427,8 @@ namespace ams
         amsstring q;
         std::vector<amsstring> q2;
     
-        fp = fopen("../ref/0p375_hexbolt.scad","r");
-        fp2 = fopen("../ref/testrewrite.scad","w+");
+        fp = fopen("./ref/0p375_hexbolt.scad","r");
+        fp2 = fopen("./ref/testrewrite.scad","w+");
     
         I = 0;
         while(!feof(fp))
diff --git a/src/main.cpp b/src/main.cpp
index 7189c5a..bb912c9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -18,7 +18,7 @@ int main(int argc, char* argv[])
     amsstring4_test_splitlines();
     amsstring4_test_split();
     amsstring4_test_strip();
-    //amsstring4_test_freadwrite();
+    amsstring4_test_freadwrite();
 
     amsstring4_test_concatenation_operators();