Brian Dereu of Hollow Spy Coins showed us how to make this hollow dead-drop bolt for stashing secret messages back in MAKE 16. It’s not hard to do if you have access to the necessary equipment–a drill press, hacksaw, vise, grinder, and the appropriate taps and dies. But if you don’t have those tools, or you don’t have the time to use them, and you still want a spy bolt, Brian will gladly sell you one hand-made by his family and him for the not-unreasonable price of $37.

In the Makers Market: Dead drop spike

From the pages of MAKE:

MAKE Volume 16, Spy Tech! Learn how to build and use tiny surveillance devices, and how to know if a spy is using them on you. From tiny video cameras to sneaky recorders, this volume has enough cool stuff to make James Bond’s inventor Q envious. Don’t forget, subscribers can always read the digital edition here.

Sean Michael Ragan

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and My work has also appeared in ReadyMade, c’t – Magazin für Computertechnik, and The Wall Street Journal.

  • mada1234

    I have made a few similar ‘bolts’ like this,, but mine are for geocaches! They make a great micro cache ;)

  • long nguyen

    JAMES MILNER: Normally xem độ bóng đá hôm nay useful, like a spatula, but there were occasions against Switzerland where Milner let things through like a sieve. Created two chances in the first half (more than any other player), but that is where the praise ends. Gave away the ball with a quarter of his passes in the opposition half, but not helped by tỉ lệ cá cược Delph’s early substitution. Ross Barkley’s introduction forced him to effectively carry out two roles.

  • Thai Nguyen

    Player 2: A big club shows interest,cá độ đá banh online his own club refuse big offers and he knows the only way to force a move is to hand in a transfer request – this happens right on cue.
    Reaction: Own club fans – no real reaction,kèo cá độ bóng đá no anger. Press: defend the player. Club: “He didn’t mean to ask for a transfer” – What the F***?
    MEM (Veria), London Gunner ti le ca cuoc bong da cup c1

  • nhan

    Be Aware of Transfer Windows and Governing Body Regulations

    Since players may only be transferred huong dan ca do tren mang during transfer windows, it makes sense for a person interested in transfer betting to keep track of when transfer ty le keo truc tuyen bong da windows are open. For example, the next one will not open until January of 2012. The regulations and restrictions placed on player transfers by the governing body of a football club’s league should also be noted, since dat cuoc bong da different associations may have their own rules on how transfers are completed.

  • nhan

    Serie A outfit Fiorentina are interested ty so ca cuoc bong da truc tuyen in taking Chelsea defender Kurt Zouma on loan in January, according to Italian newspaper Corriere dello Sport.

    Considering Zouma has featured in all ty so ca cuoc truc tuyen four of Chelsea’s games this season, it seems unlikely, but the Italian outlet is reporting that the Viola had considered making an offer in asdasthe summer, and will renew their interest in January.

    With an ageing John Terry, Gary Cahill struggling ty so da banh truc tuyen for form, a rapidly declining right-back in Branislav Ivanovic and, well, Papy Djilobodji as his other central defensive options, we can’t quite envisage Jose Mourinho sanctioning Zouma’s exit.

  • nhan

    Profit and Loss Sectors when Betting on the Away Team

    Looking at the profit/loss (P/L) summarie độ bóng đá online in the ‘Totals’ column, adding together the first six rows of odds clusters produces a loss of -2,564 units, based on a flat stake of 100 units per bet.

    Essentially this means if the away team was priced hướng dẫn cá cược bóng đá as a clear favourite or close to the home team’s prices, they won less frequently than the probabilities indicated by their odds. The last of these first six cluster groups closes at away odds of 2.90.

    Look at the second row of the table. The odds cluster between 1.66 (implied probability 60.2%) and 2.00 (implied probability 50%) contains 83 matches and, if the odds had been ‘fair’, 55.1% (60.2% + 50% / 2) of the away teams priced in this group should have won.

    As you can see, this was not the case! Of 83 games in five seasons only 43 were away wins (51.8%).

    Therefore, punters who regularly backed away favourites in the Bundesliga during 2010-15 surrendered ‘value’ in their bets to the bookmakers. When this happens, only one side of the deal wins in the long-run; invariably it isn’t the bettors!