How to remove the broken screw?
Broken head slightly exposed, available shovel shovel out the direction of the screw slowly shovel out.
When the screw is broken, if a part is exposed, it can be screwed out with the appropriate pliers, or a square nut is welded to the broken screw to screw out the dowel screw.
Drill a properly sized hole on the jumper screw, insert a pyramid or change it into a reverse thread, and screw the screw in the reverse thread and then unscrew the screw in the usual way.
The other are open to grow a little, grinding flat to seize the rotation, or the middle cut a knife with a zigzag tool to turn, the bigger the better to take the iron put on the surface of the welding, or with a word tool alignment loose Open the direction of the angle to play a few turn a few times, did not save the drill through the hole directly through the big mouth to re-open teeth on the line.
Thick (5 or more) easy to handle, playing a hole with a dedicated wire on the line. Fine can be trouble, it is better to just re-drilling tapping.
