Hopefully fixes some tool-conversion things

code/game/objects/structures/catwalk.dm

@@ -67,7 +67,7 @@
 	return
 
 /obj/structure/catwalk/attackby(obj/item/C as obj, mob/user as mob)
-	if(C.is_welder())
+	if(istype(C, /obj/item/weapon/weldingtool))
 		var/obj/item/weapon/weldingtool/WT = C
 		if(WT.isOn())
 			if(WT.remove_fuel(0, user))

code/game/objects/structures/door_assembly.dm

@@ -170,7 +170,7 @@
 		rename_door(user)
 		return
 
-	if(W.is_welder() && ( (istext(glass)) || (glass == 1) || (!anchored) ))
+	if(istype(W, /obj/item/weapon/weldingtool) && ( (istext(glass)) || (glass == 1) || (!anchored) ))
 		var/obj/item/weapon/weldingtool/WT = W
 		if (WT.remove_fuel(0, user))
 			playsound(src, WT.usesound, 50, 1)
@@ -212,7 +212,7 @@
 			to_chat(user, "<span class='notice'>You [anchored? "un" : ""]secured the airlock assembly!</span>")
 			anchored = !anchored
 
-	else if(W.is_cable_coil() && state == 0 && anchored)
+	else if(istype(W, /obj/item/stack/cable_coil) && state == 0 && anchored)
 		var/obj/item/stack/cable_coil/C = W
 		if (C.get_amount() < 1)
 			to_chat(user, "<span class='warning'>You need one length of coil to wire the airlock assembly.</span>")

code/game/objects/structures/railing.dm

@@ -207,7 +207,7 @@
 			return
 
 	// Repair
-	if(health < maxhealth && W.is_welder())
+	if(health < maxhealth && istype(W, /obj/item/weapon/weldingtool))
 		var/obj/item/weapon/weldingtool/F = W
 		if(F.welding)
 			playsound(src.loc, F.usesound, 50, 1)

code/game/objects/structures/windoor_assembly.dm

@@ -89,7 +89,7 @@ obj/structure/windoor_assembly/Destroy()
 
 	switch(state)
 		if("01")
-			if(W.is_welder() && !anchored )
+			if(istype(W, /obj/item/weapon/weldingtool) && !anchored )
 				var/obj/item/weapon/weldingtool/WT = W
 				if (WT.remove_fuel(0,user))
 					user.visible_message("[user] disassembles the windoor assembly.", "You start to disassemble the windoor assembly.")
@@ -130,7 +130,7 @@ obj/structure/windoor_assembly/Destroy()
 					step = null
 
 			//Adding cable to the assembly. Step 5 complete.
-			else if(W.is_cable_coil() && anchored)
+			else if(istype(W, /obj/item/stack/cable_coil) && anchored)
 				user.visible_message("[user] wires the windoor assembly.", "You start to wire the windoor assembly.")
 
 				var/obj/item/stack/cable_coil/CC = W

code/game/objects/structures/window.dm

@@ -220,7 +220,7 @@
 	if(!istype(W)) return//I really wish I did not need this
 
 	// Fixing.
-	if(W.is_welder() && user.a_intent == I_HELP)
+	if(istype(W, /obj/item/weapon/weldingtool) && user.a_intent == I_HELP)
 		var/obj/item/weapon/weldingtool/WT = W
 		if(health < maxhealth)
 			if(WT.remove_fuel(1 ,user))
@@ -294,7 +294,7 @@
 			if(is_fulltile())
 				mats.amount = 4
 			qdel(src)
-	else if(W.is_cable_coil() && reinf && state == 0 && !istype(src, /obj/structure/window/reinforced/polarized))
+	else if(istype(W, /obj/item/stack/cable_coil) && reinf && state == 0 && !istype(src, /obj/structure/window/reinforced/polarized))
 		var/obj/item/stack/cable_coil/C = W
 		if (C.use(1))
 			playsound(src.loc, 'sound/effects/sparks1.ogg', 75, 1)
@@ -572,7 +572,7 @@
 	maxhealth = 80
 
 /obj/structure/window/reinforced/polarized/attackby(obj/item/W as obj, mob/user as mob)
-	if(W.is_multitool() && !anchored) // Only allow programming if unanchored!
+	if(istype(W, /obj/item/device/multitool) && !anchored) // Only allow programming if unanchored!
 		var/obj/item/device/multitool/MT = W
 		// First check if they have a windowtint button buffered
 		if(istype(MT.connectable, /obj/machinery/button/windowtint))
@@ -632,7 +632,7 @@
 	icon_state = "light[active]"
 
 /obj/machinery/button/windowtint/attackby(obj/item/W as obj, mob/user as mob)
-	if(W.is_multitool())
+	if(istype(W, /obj/item/device/multitool))
 		var/obj/item/device/multitool/MT = W
 		if(!id)
 			// If no ID is set yet (newly built button?) let them select an ID for first-time use!