Spacer: No.2 (Axle, Starburst, and Spacers are fine-tuned with optional parts, depending on the feeling)
Other Tips: [Why use LOOP2020?]
The first reason: Because I do a lot of breast stroke-type moves, I use the LOOP2020 because it is easy to correct and stabilize even if the trajectory becomes unstable.
Second reason: Because the center of gravity is in the middle and the loop trajectory is downward, which makes the trajectory more stable and faster.
Third reason: The optional parts can be used to adjust for minute differences.
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