You can now attach a string to coins using cable coil (remove with wirecutters). With a string attached you have a chance to recover the coin when buying an item from a vending machine that requires a coin.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@2212 316c924e-a436-60f5-8080-3fe189b3f50e

code/game/machinery/vending.dm

@@ -245,7 +245,17 @@
 				return
 
 			if (R in coin_records)
-				del(coin)
+				if(!coin)
+					usr << "\blue You need to insert a coin to get this item."
+					return
+				if(coin.string_attached)
+					if(prob(50))
+						usr << "\blue You successfully pull the coin out before the [src] could swallow it."
+					else
+						usr << "\blue You weren't able to pull the coin out fast enough, the machine ate it, string and all."
+						del(coin)
+				else
+					del(coin)
 
 			R.amount--
 

code/modules/mining/ores_materials_coins.dm

@@ -98,6 +98,7 @@
 	force = 0.0
 	throwforce = 0.0
 	w_class = 1.0
+	var/string_attached
 
 /obj/item/weapon/coin/New()
 	pixel_x = rand(0,16)-8
@@ -135,6 +136,34 @@
 	name = "Adamantine coin"
 	icon_state = "coin_adamantine"
 
+/obj/item/weapon/coin/attackby(obj/item/weapon/W as obj, mob/user as mob)
+	if(istype(W,/obj/item/weapon/cable_coil) )
+		var/obj/item/weapon/cable_coil/CC = W
+		if(string_attached)
+			user << "\blue There already is a string attached to this coin."
+			return
+
+		if(CC.amount <= 0)
+			user << "\blue This cable coil appears to be empty."
+			del(CC)
+			return
+
+		overlays += image('items.dmi',"coin_string_overlay")
+		string_attached = 1
+		user << "\blue You attach a string to the coin."
+		CC.use(1)
+	else if(istype(W,/obj/item/weapon/wirecutters) )
+		if(!string_attached)
+			..()
+			return
+
+		var/obj/item/weapon/cable_coil/CC = new/obj/item/weapon/cable_coil(user.loc)
+		CC.amount = 1
+		CC.updateicon()
+		overlays = list()
+		string_attached = null
+		user << "\blue You detach the string from the coin."
+	else ..()
 
 /******************************Materials****************************/