Well I have heard many people have protected their bases using locked chests... So why can't we do it to the mob spawners? Yes It would cost a fair amount (5k to be exact).4 Locked chests on the sides (and the signs placed above on the block on top of the spawner). The under belly of the spawner will be locked by placing a block (cobble or something) and placing a lock sign with a chest under that.So what do you guys think? If this works won't it mean they are unbreakable? Besides from the guy/girl who made the locks of course. Then we might be able to sell spawners?