author
87CommentsJoined May 18th, 2006
"Reverse engineer." previously employed in aerospace manufacturing and repair, now working as a locksmith at a casino.
  • dll932 commented on landimatteo's instructable Pitot - Static Tube DIY10 months ago
    Pitot - Static Tube DIY

    Very good. I imagine if the wind velocity was constant, one could make two runs in opposite directions and average the reading. My last job was actually building and testing pitot tubes and static ports, BTW. It's an interesting project you propose.

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  • dll932 commented on landimatteo's instructable Pitot - Static Tube DIY10 months ago
    Pitot - Static Tube DIY

    I used to work on aircraft instruments. Because the gauge is part of a system including the pitot tube, it won't be accurate till it's calibrated. You'll have to compared indicated speed with a speedometer or GPS. Also, the pitot tube has to be in calm air, not turbulent to read right. Get one that reads no higher than 100-140 so the scale is wide enough. Be aware it won't be real accurate at very low speeds and that driving into a headwind will make it read high.

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  • Cleaning and Repairing an Antique Mortise Door Lock

    Au contraire, mon frere-Aftermarket mortise lock knobs are easily available at many hardware and Big Box type stores. And there's always Amazon:http://www.amazon.com/Ultra-Hardware-43010-Solid-Brass/dp/B002O75DBS/ref=sr_1_6/184-3008833-0059929?ie=UTF8&qid=1465012229&sr=8-6&keywords=Mortise+Door+Knobs.

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  • dll932 commented on mmmmqc's instructable Testing batteries with multimeter1 year ago
    Testing batteries with multimeter

    Lead acid batteries should test at 2 volts per cell but you should still load test them. I understand that you can't properly test lithium ion batteries without special equipment.

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  • How to Pick Simple Locks/Latches with a Paper Clip

    Very good, but burglars won't be doing that. Same with bumping. They want to get in and out quick. However, high security locks like Medeco and Abloy, etc. are also made sturdier than the stuff you find at Big Box.

    At the least, replace the 7/8" long screws with 3" screws. Better yet, get a reinforced strike plate-they're larger and spread out the stress.

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  • Cleaning and Repairing an Antique Mortise Door Lock

    You may have to apply a crescent wrench or vise grip type pliers to the ferrule (the metal part closest to the door) and use force to unscrew them CCW. This will likely destroy the knobs but they can be had at many hardware stores inexpensively. NOTE: I am assuming the knob setscrews have already been removed.

    For anyone who has more questions, I would suggest googling the subject, because someone else is sure to have had the same problem you ran into. There are HUNDREDS of different mortise lock designs, if not more. That means sometimes only a general answer can be given here. If you know the name of the lock, try googling THAT. There is an amazing amount of material on the web about old locks.

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  • How to Pick Simple Locks/Latches with a Paper Clip

    As a locksmith, I'd like to weigh in here. 1) "Professional" thieves: Anyone who is expert at bypassing locks and alarms probably works for one of those "3 letter agencies." No, I'm not kidding. The average burglar uses a hammer, a crowbar or a foot to gain entry.2) Locks CAN slow burglars down quite a bit...if you have good ones (and reinforce the strike in the frame). Any lock rated Grade 1 will resist a good bit of force and locks can be keyed to resist picking. High security locks can be had that are virtually pick proof, but they're pricey. Your judgement call as to how much to spend.3) Breaking windows makes noise, which burglars don't want to make. Even so, you can apply film to glass to make it harder to break (3M makes it) or apply plexiglass over the window...

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    As a locksmith, I'd like to weigh in here. 1) "Professional" thieves: Anyone who is expert at bypassing locks and alarms probably works for one of those "3 letter agencies." No, I'm not kidding. The average burglar uses a hammer, a crowbar or a foot to gain entry.2) Locks CAN slow burglars down quite a bit...if you have good ones (and reinforce the strike in the frame). Any lock rated Grade 1 will resist a good bit of force and locks can be keyed to resist picking. High security locks can be had that are virtually pick proof, but they're pricey. Your judgement call as to how much to spend.3) Breaking windows makes noise, which burglars don't want to make. Even so, you can apply film to glass to make it harder to break (3M makes it) or apply plexiglass over the windows in your door. 4) Just having decent locks (especially dead bolts) can be enough to dissuade the casual would be burglar.

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