diff --git a/research/custom_loader/b.cc b/research/custom_loader/b.cc
index 0127465..fd80703 100644
--- a/research/custom_loader/b.cc
+++ b/research/custom_loader/b.cc
@@ -642,7 +642,7 @@ void build_cache(struct libcache& cache, void* main) {
     char *name = dyld_get_image_name_func(i);
     bootstrap_libcache_item(&cache.libs[i], header, name);
     cache.libs[i].hash = calculate_libname_hash(&cache, name);
-    printf("%p %s\n", header, name);
+    // printf("%p %s\n", header, name);
   }
 }
 
@@ -709,6 +709,7 @@ void fix(struct libcache& cache) {
   // think of a way to get what binary to fix
   // so we can iterate through them
   struct libcache_item* libfixing = get_libcache_with_name(&cache, "./out/a");
+  // print_macho_summary(libfixing->header);
   for (int i = 0; i < nimports; i++) {
     struct imported_symbol symbol = imported_table[i];
     uint64_t fix_at = symbol.offset + libfixing->segment[symbol.segment_i];
@@ -716,13 +717,13 @@ void fix(struct libcache& cache) {
     int need_rw_fix = true;
     for (int j = 0; j < npage_rw_fixed; j++) {
       if (page_rw_fixed[j] <= fix_at &&
-          page_rw_fixed[j] + 0x4000 > fix_at) {
+          page_rw_fixed[j] + 0x1000 > fix_at) {
         need_rw_fix = false;
       }
     }
     if (need_rw_fix) {
-      uint64_t start_page = fix_at - (fix_at % 0x4000);
-      vm_protect_func(mach_task_self_func(), start_page, 0x4000, 0,
+      uint64_t start_page = fix_at - (fix_at % 0x1000);
+      vm_protect_func(mach_task_self_func(), start_page, 0x1000, 0,
                       VM_PROT_READ | VM_PROT_WRITE);
       page_rw_fixed[npage_rw_fixed++] = start_page;
       printf("modify page starts at 0x%llx to RW\n", start_page);
diff --git a/research/custom_loader/build.sh b/research/custom_loader/build.sh
index 249ff37..442bf99 100755
--- a/research/custom_loader/build.sh
+++ b/research/custom_loader/build.sh
@@ -1,11 +1,19 @@
-set -ex
+# set -ex
 
-VERSION=11
+VERSION=${1:-14}
 OUT=./out
 LOGIC=2
 
 mkdir -p $OUT
 
+echo "using mach-o version $VERSION"
+if [[ $VERSION -ge 14 ]]
+then
+  echo "Resulting binary uses MODERN symbol resolver"
+else
+  echo "Resulting binary uses LEGACY symbol resolver"
+fi
+
 if [[ $LOGIC -eq 0 ]]
 then
 
@@ -38,6 +46,8 @@ clang++ -mmacosx-version-min=$VERSION -o $OUT/a -L"./out" -lb a.cc
 # build libb with symbols extracted from a
 clang++ -mmacosx-version-min=$VERSION -o $OUT/libb.dylib -shared -Wl,-reexport_library out/libc.dylib b.cc
 
+out/a
+
 else
 
 # dummy test build