Tap Wrench operate main point:
1. The good pit hole must chamfering chamfer first
2. To use drill clamp supporting tap
3. Tap to vertical alignment operation
4. Cut into rotation level 2-3 times
5. confirm vertical after Cut
6. Tapping 3/4 turn after a quarterback feeling
7. level reversal pull out after working
8. Remember that cutting metal need to use with the oil