The one company that makes it must be going out of business or is selling off. They were always a sh*t company. I ordered one a couple years ago and had to dispute the charges because I never received it after 2 months. I recently tried their website and it was down.
Just brake clean everything inside. Then to adjust there is a plug on the back that reveals the adjuster. You will need a brake spoon or a screw driver to move it. While adjusting, spin the drum until it has decent drag but not stuck.
I also agree to stick with your current Prius. It’s not even broken in yet, and it sounds like you have good luck with it. I would get the spark plugs changed and clean the throttle and drive it.
I have the rubber damper installed in mine with no problems. I did find out sometimes the bolts will get a little loose after too much flexing. Causing a weird popping noise when flexing or turning hard.
Don’t worry about caster, it won’t wear your tires. Just as long as its close to the other side, it should be fine. The rear toe can be adjusted with shims and is a pain in the ass. You may even need a new wheel bearing when putting the shim in.
Just did a PDI on a 2020 hybrid, didn’t think they were coming out this early. Definitely quicker than a non hybrid corolla. But here are some pictures.