What are the potential risks and consequences of buying used bike tools, and how can a buyer assess the tools condition and authenticity to ensure a safe and reliable purchase? Can buying used bike tools lead to equipment failure, accidents, or injuries, and if so, what precautions can buyers take to mitigate these risks? Are there any particular types of bike tools that are more susceptible to wear and tear or damage, and should buyers prioritize certain tools over others when purchasing used? How can buyers verify the sellers claims about the tools condition and usage history, and what red flags should they watch out for when purchasing used bike tools online? Do manufacturers or reputable bike shops provide any warranties or guarantees for used bike tools, and if not, what alternatives are available to buyers who want to ensure the quality and reliability of their tools?