Sellita SW200-1: Avoiding Failures After Assembly – What Do You Check?

[mehm]

Hello fellow watchmakers,

I have a question for all of you, especially those who regularly work with the Sellita SW200-1 movement.

At my workplace, we mostly handle watches with the SW200-1. As many of you might already know, this movement has a known issue with the ratchet wheel teeth breaking. However, recently, I've observed a noticeable increase in problems like:

More frequent ratchet wheel teeth breakage

Screws getting loose and falling off

Sudden drops in amplitude

And other irregular behaviors

So here’s my main question:

Before doing the final assembly of an SW200-1, what are the mandatory checks I should perform to ensure proper functioning and avoid post-service failures?

For example, I already check:

Ratchet wheel teeth condition

Canon pinion friction

Accuracy and amplitude

Screw tightness

Jewels condition

But I’d love to hear from all of you — what other important things do you check during assembly?

Any tips, tricks, or personal checklist items would be extremely helpful for me and ot

hers working on this movement.