Somewhat disappointed in this item. While the length, size and heft is everything you would want if you're looking for a massive unit, I'm afraid it's design doesn't lend itself to strap-on play.
Trouble is the base. There's no flare/base at the top of the shaft and a because of the heft and flexibility of the material, the top tends to slip out of the harness no matter how snug of an o ring you use, leaving it hanging straight down by the balls.
Consider this a design flaw, which is unfortunate.