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Make sure that the insert is not upside down.
For tapered screws for pipes, there is a tapered on the insert side.
Therefore, if the insert is installed on the wrong side, it will be reversed and a step will occur.
When installing a right-handed insert for a right-handed holder (LH is not in the model number), it is necessary to install it so that the letter "R" is visible.
If you can read "L" on the attached insert, it is reversed.
* If the model number of the holder contains "LH", the correct method is to install it so that the letter "L" can be seen when the insert is attached.
Reference: Orientation of thread mill inserts for tapered threads for exchangeable tube threads
(FAQID:183)