Originally Posted by
TejanoTrackie
It looks like that tool is designed primarily for tightening chainring bolts, not loosening them. As soon as you begin to loosen the bolt, it will lose its grip on the nut, and allow it to spin in the chainring it the bolt is seized up inside the nut.
That appears to be a spring on the device, not a thread. So as you turn to extract the bolt, it wont back off.
Not the best picture if you're trying to sell em!
Barry