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What do you do when the threads at the crank arm is spoiled? Here are the quick 3 steps to solve it (as far as the main chainring securing bolt is concern anyway):
![](http://www.petrelli.cc/wp-content/uploads/2018/09/spoiled_threads_at_the_crank_001-1024x681.jpg)
Step 1 – identify where the problem was.
![](http://www.petrelli.cc/wp-content/uploads/2018/09/spoiled_threads_at_the_crank_002-1024x681.jpg)
Step 2 – re-thread the threads with the M8 1.0 tool.
![](http://www.petrelli.cc/wp-content/uploads/2018/09/spoiled_threads_at_the_crank_003-1024x681.jpg)
Step 3 – Screw the bolts back in and it should be just nice.