A Common Fault Cropping up With These Sergers/Overlockers - Frister & Rossmann/Globe/White

There's a plastic gear in these sergers that is failing and I show you how to assess it quickly and then confirm it.
Theses sergers/overlockers are often known under several brands such as Frister & Rossmann, Globe and White. This video covers the M series models.
These sergers are of very good quality and are a very well built machine, not to mention very nice to use, but they have an issue where the plastic looper drive gear cracks. If the crack is not too bad, you may not even know it's there, but it may get worse with time. If the crack is very bad, you may find the machine does not run at all.
There is one model that has a metal gear instead of the plastic one but I've only ever seen one among plenty of plastic gear models.
The gear can be replaced but it is an expensive repair, taking into account the price of the part and the labour involved.
I recommend checking any one of these models before purchasing on the second hand market. You may find one in good condition but it would always be in the back of my mind as to how long it will last. If you can find one with a metal gear, you're good to go.
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Index
0:00 - Introduction
1:39 - Quickly checking for the problem by feel
2:35 - Visually inspecting the looper drive gear
9:16 - Explaining what's involved in changing the gear
11:27 - The cause of the gear failure
12:48 - The metal gear model
14:24 - Rambling
15:43 - Showing the 2/3 thread switch
16:33 - Conclusion and thanks