You could always put a strap on the unit, they obviously are going to aggravate vintage muscles cuz we tend to lean forward with the weight supported on our lower back….I hate to admit it but old age and poor upper body strength have reduced me to using the smaller battery powered weed whips. The Black and Decker ones I'm resigned to using last about two years if I'm lucky. By the time the battery no longer takes a lasting charge "they" change the design and I have to get a whole new unit. Talk about a disposable society....rant over!
I have the B&D 40V weedwacker for a few years now….only issue was it quit and a wire had broken loose from the motor…it was so obvious that i could see the issue. Soldered it back together.