diff --git a/017_science/control.lua b/017_science/control.lua
index a2ea450..3fe6f3a 100644
--- a/017_science/control.lua
+++ b/017_science/control.lua
@@ -107,8 +107,12 @@ if settings.startup["017-axe"].value then
 		if player.cursor_stack.valid_for_read then
 			-- game.print(axe)
 			-- game.print(player.cursor_stack.name)
-			if player.cursor_stack.name == highest_speed[player.force.name][1] then 
-				player.clean_cursor()
+			if highest_speed == nil then
+				ax_gen()
+			else
+				if player.cursor_stack.name == highest_speed[player.force.name][1] then 
+					player.clean_cursor()
+				end
 			end
 		end
 	end)
diff --git a/017_science/data-updates.lua b/017_science/data-updates.lua
index 5d935e4..cf9b853 100644
--- a/017_science/data-updates.lua
+++ b/017_science/data-updates.lua
@@ -90,6 +90,82 @@ if settings.startup["017-axe"].value then
 	end
 end
 
+if settings.startup["017-equipment"].value and data.raw["recipe"]["belt-immunity-equipment"] == nil then
+	data:extend({
+		{
+			type = "technology",
+			name = "belt-immunity-equipment",
+			icon_size = 128,
+			icon = "__017_science__/graphics/belt-immunity-equipment.png",
+			prerequisites = {"modular-armor"},
+			effects =
+			{
+				{
+					type = "unlock-recipe",
+					recipe = "belt-immunity-equipment"
+				}
+			},
+			unit =
+			{
+				count = 50,
+				ingredients = {{"science-pack-1", 1}, {"science-pack-2", 1}},
+				time = 15
+			},
+			order = "g-ga"
+		},
+		{
+			type = "recipe",
+			name = "belt-immunity-equipment",
+			enabled = false,
+			energy_required = 10,
+			ingredients =
+			{
+				{"advanced-circuit", 5},
+				{"steel-plate", 10}
+			},
+			result = "belt-immunity-equipment"
+		}
+	})
+end
+
+local lds_recipes = {
+	"energy-shield-mk2-equipment",
+	"battery-mk2-equipment",
+	"fusion-reactor-equipment",
+	"personal-laser-defense-equipment",
+	"discharge-defense-equipment", -- sorry for indirectly nerfing discharge-defense :(
+	"exoskeleton-equipment",
+	"personal-roboport-mk2-equipment",
+	"power-armor-mk2"
+}
+
+if settings.startup["017-lds"].value then
+	local recipe = data.raw["recipe"]
+	for _, r in pairs(recipe) do
+		for _, l in pairs(lds_recipes) do
+			if r.name == l then
+				modified = false
+				for _=1, #r.ingredients do
+					if r.ingredients[_][1] == "steel-plate" then
+						local n = math.ceil(r.ingredients[_][2] / 2)
+						table.remove(r.ingredients, _)
+						r.ingredients[#r.ingredients+1] = {"low-density-structure", n}
+						modified = true
+					end
+				end
+				if modified == false then
+					for _=1, #r.ingredients do
+						if r.ingredients[_][1] == "processing-unit" then
+							local n = math.ceil(r.ingredients[_][2] / settings.startup["017-lds-num"].value)
+							r.ingredients[#r.ingredients+1] = {"low-density-structure", n}
+						end
+					end
+				end
+			end
+		end
+	end
+end
+
 --HUGE THANKS to Dimava for the following changes
 --Added options for some changes (for modded users)
 
diff --git a/017_science/graphics/belt-immunity-equipment.png b/017_science/graphics/belt-immunity-equipment.png
new file mode 100644
index 0000000..6b3da81
Binary files /dev/null and b/017_science/graphics/belt-immunity-equipment.png differ
diff --git a/017_science/info.json b/017_science/info.json
index c152226..ca54dd7 100644
--- a/017_science/info.json
+++ b/017_science/info.json
@@ -1,6 +1,6 @@
 {
   "name": "017_science",
-  "version": "0.0.10",
+  "version": "0.0.11",
   "factorio_version": "0.16",
   "title": "0.17 science conversion",
   "author": "npc_strider(morley376)",
diff --git a/017_science/locale/en/base.cfg b/017_science/locale/en/base.cfg
index f955ec2..e36735f 100644
--- a/017_science/locale/en/base.cfg
+++ b/017_science/locale/en/base.cfg
@@ -1,3 +1,6 @@
+[technology-name]
+belt-immunity-equipment=Belt immunity equipment
+
 [item-name]
 science-pack-1=Automation science pack
 science-pack-2=Logistics science pack
@@ -13,6 +16,9 @@ high-tech-science-pack=Utility science pack
 017-recipes-changes=Misc. recipe changes in 0.17
 017-durability=Infinite armor/tool durability
 017-axe=mining-tool (axe) removal
+017-equipment=Belt immunity equipment
+017-lds=low-density-structure in recipes
+017-lds-num=low-density-structure factor
 
 [mod-setting-description]
 017-drill=(Default enabled) Toggle FFF-266 mining changes (removed hardness). This mod makes all vanilla ore hardness = 1 and makes the burner-mining-drill mining_power = 3, which may break modded ore gating.
@@ -21,4 +27,7 @@ high-tech-science-pack=Utility science pack
 017-old-science=(Default disabled) Toggle the old science recipes (0.16), including LDS. When disabled it removes the ability to use the vanilla science and LDS recipes (except SP 1 & 2) but allows existing crafting machines to continue using the recipe until manually changed.
 017-recipes-changes=(Default enabled) atomic-bomb and power-armor-mk2 recipe changes 
 017-durability=(Default enabled) All armor now have inf. durability (https://forums.factorio.com/viewtopic.php?p=384185#p384185). Axes also have inf. durability to reflect the removal of mining-tool items.
-017-axe=(Default enabled) IMPORTANT NOTE: It is highly recomended that infinite durability is enabled when using this option to prevent duplicate items. Implements the FFF-266 changes as best as possible. Instead of mining-tools being crafted, they are inserted and locked to the player's tool slot when they're researched. The best mining-tool is used over lower speed ones.
\ No newline at end of file
+017-axe=(Default enabled) IMPORTANT NOTE: It is highly recomended that infinite durability is enabled when using this option to prevent duplicate items. Implements the FFF-266 changes as best as possible. Instead of mining-tools being crafted, they are inserted and locked to the player's tool slot when they're researched. The best mining-tool is used over lower speed ones.
+017-equipment=(Default enabled) Adds belt-immunity-equipment tech and recipe (FFF-256). Note that if another mod that adds belt-immunity-equipment recipe is present, this mod's unlock will be disabled. Disabling this option in an existing game will NOT remove the item - only the recipe & tech.
+017-lds=(Default enabled) low-density-structure is also used in multiple advanced personal equipment recipes (mk2 items, fusion reactor, laser defense) instead of steel (FFF-257). NOTE: the cost values in this mod are NOT official, and won't affect other mods (contact me if you want your modded recipe added.). Where possible the cost = math.ceil(n("steel-plate")/2)
+017-lds-num=(Default 5) When steel-plate is not present in vanilla 'high tech' equipment recipes, the cost is determined by the number of "processing-unit"s. math.ceil(n("processing-unit")/thissetting)
\ No newline at end of file
diff --git a/017_science/settings.lua b/017_science/settings.lua
index 6be1076..19f8328 100644
--- a/017_science/settings.lua
+++ b/017_science/settings.lua
@@ -41,5 +41,25 @@ data:extend(
         name = "017-durability",
         setting_type = "startup",
         default_value = true
+    },
+	{
+        type = "bool-setting",
+        name = "017-lds",
+        setting_type = "startup",
+        default_value = true
+    },
+	{
+        type = "int-setting",
+        name = "017-lds-num",
+        setting_type = "startup",
+		minimum_value = 1,
+		maximum_value = 32,
+        default_value = 5
+    },
+	{
+        type = "bool-setting",
+        name = "017-equipment",
+        setting_type = "startup",
+        default_value = true
     }
 })
\ No newline at end of file