diff --git a/basic_machines/concentrator.lua b/basic_machines/concentrator.lua
index 40e836d..cba0f58 100644
--- a/basic_machines/concentrator.lua
+++ b/basic_machines/concentrator.lua
@@ -3,7 +3,7 @@
 	TechAge
 	=======
 
-	Copyright (C) 2019-2021 Joachim Stolberg
+	Copyright (C) 2019-2022 Joachim Stolberg
 
 	AGPL v3
 	See LICENSE.txt for more information
@@ -54,6 +54,12 @@ local names = networks.register_junction("techage:concentrator", 2/8, Boxes, Tub
 		local name = "techage:concentrator"..networks.junction_type(pos, Tube, "R", node.param2)
 		minetest.swap_node(pos, {name = name, param2 = node.param2})
 	end,
+	ta_rotate_node = function(pos, node, new_param2)
+		Tube:after_dig_node(pos)
+		minetest.swap_node(pos, {name = node.name, param2 = new_param2})
+		Tube:after_place_node(pos)
+		M(pos):set_int("push_dir", techage.side_to_outdir("R", new_param2))
+	end,
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_node(pos)
 	end,
@@ -93,6 +99,12 @@ names = networks.register_junction("techage:ta4_concentrator", 2/8, Boxes, Tube,
 		local name = "techage:ta4_concentrator"..networks.junction_type(pos, Tube, "R", node.param2)
 		minetest.swap_node(pos, {name = name, param2 = node.param2})
 	end,
+	ta_rotate_node = function(pos, node, new_param2)
+		Tube:after_dig_node(pos)
+		minetest.swap_node(pos, {name = node.name, param2 = new_param2})
+		Tube:after_place_node(pos)
+		M(pos):set_int("push_dir", techage.side_to_outdir("R", new_param2))
+	end,
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_node(pos)
 	end,
diff --git a/tools/screwdriver.lua b/tools/screwdriver.lua
index e0bf50a..26f0929 100644
--- a/tools/screwdriver.lua
+++ b/tools/screwdriver.lua
@@ -54,12 +54,12 @@ end
 
 
 local function store_node_param2(user, node)
-	user:get_meta():set_string("techage_screwdriver_param2", node.param2)
+	user:get_meta():set_int("techage_screwdriver_param2", node.param2)
 	minetest.chat_send_player(user:get_player_name(), S("Block alignment stored!"))
 end
 
 local function turn_node_param2(pos, node, ndef, user)
-	local param2 = user:get_meta():get_string("techage_screwdriver_param2")
+	local param2 = user:get_meta():get_int("techage_screwdriver_param2") or 0
 	if ndef.ta_rotate_node then
 		ndef.ta_rotate_node(pos, node, param2)
 	else