I just purchased a s185 with this fancy security feature at a richie brothers auction but don't know how to set it up. No books or manuals came with it. It is not locked right now and am afraid somebody will steal it from the jobsite! Also, I have a 743 that always loses it's priming. I have to squeeze the priming bulb about 6 times then it goes. Now it is getting colder up here and that priming bulb is getting very stiff to squeeze. Quite frustrating! This is the best forum I have seen, thanks everyone.