Hydraulic? Nah. Cordless / Rechargeable!

The Book you WILL Follow:

https://www.cpsc.gov/s3fs-public/325.pdf

5.3.8.1 General swing recommendations
• Hardware used to secure the suspending elements to the
swing seat and to the supporting structure should not be
removable without the use of tools.
• S-hooks are often part of a swing’s suspension system,
either attaching the suspending elements to the overhead
support bar or to the swing seat. Open S-hooks can catch
a child’s clothing and present a strangulation hazard. Shooks
should be pinched closed. An S-hook is considered
closed if there is no gap or space greater than 0.04 inches
(about the thickness of a dime).