@@ -83,21 +83,42 @@
 	sorcery.data.metallookup[fragment] = {
 		id = name; data = metal;
 		value = 1;
 	}
-	minetest.register_craftitem(screw, {
-		description = sorcery.lib.str.capitalize(name) .. ' Screw';
-		inventory_image = sorcery.lib.image('sorcery_screw.png'):multiply(sorcery.lib.color(metal.tone)):render();
-		groups = { metal = 1; sorcery_screw = 1; sorcery_tech_component = 1; };
-		_sorcery = {
-			material = {
-				id = name, data = metal;
-				powder = powder;
-				grindcost = 2, grindvalue = 1;
-				value = 0.5;
+	sorcery.data.metallookup[disc] = {
+		id = name; data = metal;
+		value = 8/3;
+	}
+	if not metal.no_craftables then
+		sorcery.data.metallookup[screw] = {
+			id = name; data = metal;
+			value = 0.5;
+		}
+		minetest.register_craftitem(screw, {
+			description = sorcery.lib.str.capitalize(name) .. ' Screw';
+			inventory_image = sorcery.lib.image('sorcery_screw.png'):multiply(sorcery.lib.color(metal.tone)):render();
+			groups = { metal = 1; sorcery_screw = 1; sorcery_tech_component = 1; };
+			_sorcery = {
+				material = {
+					id = name, data = metal;
+					powder = powder;
+					grindcost = 2, grindvalue = 1;
+					value = 0.5;
+				};
 			};
-		};
-	})
+		})
+		local reglathe = function(ty, sz)
+			sorcery.lathe.register {
+				input = ty;
+				output = {name = screw, count = sz * 2};
+				tech = 'cut', cost = 1;
+			}
+		end
+		reglathe(fragment, 1)
+		reglathe(ingot, 4)
+		reglathe(block, 4 * 9)
+	end
+
 	minetest.register_craftitem(disc, {
 		description = sorcery.lib.str.capitalize(name) .. ' Disc';
 		inventory_image = fmt('sorcery_disc_%s.png', name);
 		groups = { metal = 1; sorcery_disc = 1; sorcery_tech_component = 1; };
@@ -104,25 +125,15 @@
 		_sorcery = {
 			material = {
 				id = name, data = metal;
 				powder = powder;
-				grindvalue = (3*4) / 2;
+				grindcost = 3;
+				grindvalue = 2*4;
 				value = 4 * (2/3);
 			};
 		};
 	})
 
-	local reglathe = function(ty, sz)
-		sorcery.lathe.register {
-			input = ty;
-			output = {name = screw, count = sz * 2};
-			tech = 'cut', cost = 1;
-		}
-	end
-	reglathe(fragment, 1)
-	reglathe(ingot, 4)
-	reglathe(block, 4 * 9)
-
 	sorcery.lathe.register {
 		input = ingot, mass = 2;
 		output = {name = disc, count = 3};
 		tech = 'cut', cost = 5;