Allen Bike Carrier The Allen Key Threads On My Bike Are Worn Out And I Cant Take Them Out?

The allen key threads on my bike are worn out and i cant take them out? - allen bike carrier

can my handlebars my bike, I need a hex key (Allen wrench), and I had the wrong size .. I do not use the right size I use in my thread handlebars and now I have very closely crowded, and I can reach them. IM as a spinning and the distance is not the hex key. Now that I have the correct size and not their work. Is it possible that I take the screws? "Because it is not easy for hex keys?

everything that I can buy in my local hardware store? Nothing?
HELP PLEASE!