【Edge Sports】Master Shaft Plus mss0021 short (20.0mm) Clear 's Japan Review

I was very happy with the Master Shaft, so I bought the Plus, but it broke after less than a month.
The place where it broke is the connection between the flight and the shaft.
The threads of the barrel and shaft did not break, but the part where the flight is inserted and the connection part of the shaft snapped off.

I'm going back to the master shaft (unbranded), which is hard to insert flights but hard to pull out, and which has never broken so far.