Anyone locking their Permagreen, Zspray or HPS tank lids when you are away from your machine. It is a requirement in your area. The local extension suggested I should lock mine. I need a few Ideas on locking them. I dont want to resort to drilling into the tank. I was hoping to put a type of lockable lid onto the existing lid (one that will just spin if you try opening it, kinda like a gas tank lock). Possibly a replacement lid for my tank that locks.