A few comments. yosh stand stoppers insert into the rear of the swing arm replacing the stock adjuster plate. They fight tight. There is two small bolts in the underside of the swing arm that secure them,the chain adjusters and they are tight to the I'd of the swing arm. I have been using them for a month daily with no issue.i would not lift my bike using the yoshi stand stoppers,
i installed them, the only thing that secures them to the swingarm is a tiny screw that is maybe 3-4 threads deep, and the location of the screw is not really engineered to support the entire weight of the bike when its on the stand, its just on the bottom side.
For example when you actually tighten the spool on the yoshi stand stopper all the down to a good torque, you can actually see the stand stopper flex inside the swingarm - its that much of a POS - horrible engineering design.
all my other bikes when i put them on the stands, i have no problem bouncing up and down on the bike when its on its stands, with the Grom on the pitbull stand using the yoshi stand stoppers, it feels like the bike will snap right on the spool stands if i did that.