"New" Jelqing tool
I bought this thing I’ve since learned is called a jar wrench at a thrift shop the other day. It works really well as a jelqing device. I put my dick in the smaller curved area, not the wider one closer to the hinge (see picture).
It’s especially good for hitting the corpus cavernosa (sides) of the cock. While sitting on the edge of my chair, I place my cock (with a 25 to 50% erection) in the little curved area and grip the top two ends together fairly tightly. I hold it vertically, with the hinge towards the floor and the bottom of the tool braced against the front edge of the chair. From there it can be used sort of like a lever, with the hinge against the chair serving as the fulcrum. It can also be used horizontally, but slightly less conveniently. I think it gives me a better jelq than my power jelq (canning jar lifter with foam padded rollers) particularly on the sides of my dick.
I retrofitted mine by wrapping foam first aid tape around the curved areas.