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Things we need

1 metal triangle file

2 ohp marker

3 cloth 

Step 1:

mark a line where u need to cut using marker pen

Step 2:

file around the line using metal triangle file until u get deep imprint on glass tube

Step 3:

cover cloth around the glass tube

Step 4:

try to break it  (if note it not means try to file again )

Step 5:

by now it will break 

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