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Published on Aug 15, 2012
Here's an easy, inexpensive way to breathe new life into your bike's outmoded circular key U-lock with common, readily available hardware, and stay one step ahead of the thieves. Will prevent the notorious Bic Pen (or Biro Pen) attack! Works on Cutter, Kryptonite, Master, and virtually any U-lock/D-lock which takes a circular/tubular key.
ADDITIONAL NOTE: If you buy a repair clamp that's wider than the diameter of your U-lock, no problem! You can tighten the amount of play simply by putting another link of chain in the padlock you use to lock it. Mine only needed the single returning link to cinch it right up, leaving no space for a pen to get in.
MORE: The pipe repair clamp also doubles as a U-lock holder and mounting bracket.Check this out: