fia0001 's Japan Review

The ring I had been using was sticking out a bit. I bought it based on the other reviews and I'm so happy I did! It doesn't stick out at all, which is good!

I recommend this to anyone who is frustrated when slowing down due to a loose shaft.
This will relieve your stress!!!

Best of all, it's thin! I think this is the thinnest O-ring.
If you don't like the lumpy feeling when you tighten the shaft, this is a good choice.

Cosmo Darts O-rings are recommended because the rubber is thinner than other manufacturers, so the O-rings do not stick out from the joint between the shaft and barrel or the conversion and barrel.

This is the first time I have purchased O-rings. I am very satisfied with the results. I use it between the barrel and the shaft, and it is the first time that the shaft does not come loose. Until now, I had to repeat the process of loosening the shaft while throwing and then fixing it. However, after using this ring, I no longer have to do that, and it has clearly reduced my stress. I highly recommend this ring because it allows me to concentrate only on throwing.

Unlike other O-rings
I like it because it doesn't stick out from the shaft like other O-rings!