Make stack amount var private

code/game/objects/structures/crates_lockers/closets/syndicate.dm

@@ -116,7 +116,6 @@
 
 	for(var/i = 0, i<2, i++)
 		for(var/res in resources)
-			var/obj/item/stack/R = new res(src)
-			R.amount = R.max_amount
+			new res(src, -1)
 
 	return ..()

code/game/objects/structures/curtains.dm

@@ -43,8 +43,7 @@
 		to_chat(user, "<span class='notice'>You start to cut the shower curtains.</span>")
 		if(do_after(user, 10))
 			to_chat(user, "<span class='notice'>You cut the shower curtains.</span>")
-			var/obj/item/stack/material/plastic/A = new /obj/item/stack/material/plastic( src.loc )
-			A.amount = 3
+			new /obj/item/stack/material/plastic(src.loc, 3)
 			qdel(src)
 		return
 	else

code/game/objects/structures/droppod.dm

@@ -113,8 +113,7 @@
 		if(finished)
 			to_chat(user, "<span class='notice'>You start breaking down \the [src].</span>")
 			if(do_after(user, 10 SECONDS, src, exclusive = TASK_ALL_EXCLUSIVE))
-				var/obj/item/stack/S = new /obj/item/stack/material/plasteel(loc)
-				S.amount = 10
+				new /obj/item/stack/material/plasteel(loc, 10)
 				playsound(user, O.usesound, 50, 1)
 				qdel(src)
 		else

code/game/objects/structures/flora/trees.dm

@@ -101,8 +101,7 @@
 		return
 
 	if(product && product_amount) // Make wooden logs.
-		var/obj/item/stack/material/M = new product(get_turf(src))
-		M.amount = product_amount
+		var/obj/item/stack/material/M = new product(get_turf(src), product_amount)
 		M.update_icon()
 	visible_message("<span class='danger'>\The [src] is felled!</span>")
 	stump()

code/game/objects/structures/plasticflaps.dm

@@ -22,8 +22,7 @@
 		to_chat(user, "<span class='notice'>You start to cut the plastic flaps.</span>")
 		if(do_after(user, 10 * P.toolspeed))
 			to_chat(user, "<span class='notice'>You cut the plastic flaps.</span>")
-			var/obj/item/stack/material/plastic/A = new /obj/item/stack/material/plastic( src.loc )
-			A.amount = 4
+			new /obj/item/stack/material/plastic(src.loc, 4)
 			qdel(src)
 		return
 	else

code/game/objects/structures/window.dm

@@ -297,7 +297,7 @@
 			visible_message("<span class='notice'>[user] dismantles \the [src].</span>")
 			var/obj/item/stack/material/mats = new glasstype(loc)
 			if(is_fulltile())
-				mats.amount = 4
+				mats.set_amount(4)
 			qdel(src)
 	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