On Line Wire Strainer- Often called a “donut” or “daisy” tensioner. This tensioner is installed without cutting the wire, usually at about the midpoint of the pull.
Handle for the "Daisy" sold separately
https://powerflexfence.com/products/handle-for-on-line-wire-strainer?_pos=2&_sid=c1d8cf770&_ss=r
https://powerflexfence.com/products/g644-wheel-tightener-handle?_pos=3&_sid=c1d8cf770&_ss=r
weight .2#