Understand my explaination :)

So, I remove the O-ring of Speedmaker

Then, I pour the silicone in the Groove, I level it (In the Groove) like so. ↓


I leave it and dry completely 24 Hours, then play it.

After a Week or two, The Silicone shape like these.


It is now curved/slant, it is pretty/slightly under the groove.

Is it normal?

Yes, silicone will not last forever. It is perfectly normal.

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Should be fine.

Thanks both of you!