Bike lock maker Kryptonite struggled to reassure customers and protect its reputation on Friday following the disclosure that its famous U-lock can be foiled by a ballpoint pen. Kryptonite said it would accelerate introduction of a pen-proof version of the locks. In a statement, the Canton-based company also said it would give owners of the flawed locks an upgrade "where possible," though it offered few details.

A company spokeswoman didn't return a call for comment on Friday.

Paul Dickard, a spokesman for Kryptonite's parent company, Ingersoll-Rand, said Kryptonite executives were working diligently to ease customer and dealer concerns but did not expect the problem to affect earnings.