diff --git a/examples/mods/aim1_community_fix/my_mod.cpp b/examples/mods/aim1_community_fix/my_mod.cpp
index d8dcabf..eb41774 100644
--- a/examples/mods/aim1_community_fix/my_mod.cpp
+++ b/examples/mods/aim1_community_fix/my_mod.cpp
@@ -255,6 +255,9 @@ int main(int argc, char *argv[]) {
     mod.copy_weapon_from_aim2("GUN_GRAVITON");
     after = mod.add_map_good("location1.mmo", "B_L1_BASE1", after, mmo_storage2::map_good("GUN_GRAVITON"));
 
+    //
+    mod.replace("under.scr", "_ADDSENSOR(T_L4_BASE_2)", "_ADDSENSOR(T_L4_BASE_2 )\n_MARK(T_L4_BASE_2)");
+
     // does not work, crashes. Maybe different item size
     // or maybe too many goods
     /*for (auto after = "EQP_POLYMER_ARMOR_S1"s; auto &&[n, _] : db["Оборудование"]) {
diff --git a/src/aim1_mod_maker/aim1_mod_maker.h b/src/aim1_mod_maker/aim1_mod_maker.h
index 71287f7..29c9815 100644
--- a/src/aim1_mod_maker/aim1_mod_maker.h
+++ b/src/aim1_mod_maker/aim1_mod_maker.h
@@ -601,16 +601,21 @@ struct mod_maker {
         quest().copy_from_aim2("INFORMATION", object);
         auto &db_ = this->db();
         auto &gun = db_["Оружие"][object];
-        auto copy_if_not = [&](auto &&table, auto &&field) {
-            if (!db_[table].contains(gun[field])) {
-                db_.copy_from_aim2(table, gun[field]);
-            }
-        };
-        copy_explosion_from_aim2(gun["EXPLO"]);
-        copy_from_aim2(gun["FXMODEL"]);
-        copy_from_aim2(gun["FXMODEL2"]);
-        copy_sound_from_aim2(gun["IDSOUND"]);
-        copy_sound_from_aim2(gun["IDSOUNDEND"], true);
+        if (gun.contains("EXPLO")) {
+            copy_explosion_from_aim2(gun["EXPLO"]);
+        }
+        if (gun.contains("FXMODEL")) {
+            copy_from_aim2(gun["FXMODEL"]);
+        }
+        if (gun.contains("FXMODEL2")) {
+            copy_from_aim2(gun["FXMODEL2"]);
+        }
+        if (gun.contains("IDSOUND")) {
+            copy_sound_from_aim2(gun["IDSOUND"]);
+        }
+        if (gun.contains("IDSOUNDEND")) {
+            copy_sound_from_aim2(gun["IDSOUNDEND"], true);
+        }
         if (gun.contains("MISSILE") && !gun["MISSILE"].empty()) {
             copy_missile_from_aim2(gun["MISSILE"]);
         }
diff --git a/src/common/mmo2.h b/src/common/mmo2.h
index 879e696..b5174a9 100644
--- a/src/common/mmo2.h
+++ b/src/common/mmo2.h
@@ -67,9 +67,11 @@ struct mmo_storage2 {
         // mech_groups
         {
             sections.mech_groups.offset = s.p - f.p;
-            uint32_t n_mechs = s;
+            uint32_t n_mech_groups = s;
+            // two ints
+            // and ten more ints?
             s.skip(0x30);
-            while (n_mechs--) {
+            while (n_mech_groups--) {
                 mech_group o = s;
 
                 switch (o.type) {
@@ -94,7 +96,7 @@ struct mmo_storage2 {
 
                 while (o.n_mechs--) {
                     struct mech {
-                        char name[0x20];
+                        char cfg_name[0x20];
                     };
                     mech m = s;
                 }