Needid to reduce a springs length today.
Used my dremil to cut to desired length ,heated until red closed end coil .
Used the dremil to flatten the end carefully then a file over the whole base coil to get a flat even base before using stone and wet n dry before a pollish up

Using the file the spring broke on the coil bellow.

Never happened before, I'm sure the process was correct .
Why did it break ?. Was a used spring looked fine ,no big bend
Confused .com.