Review on Funmit Tightener Anti Rattle Stabilizer Stainless by David Cronin

I couldn't figure out how to get this to work. No instructions. My son, who loves bikes, couldn't either. I took it to the bike shop. None of the repairers could figure out how to get it working. On the way home from the bike shop, the threaded part came across a bump in the road and bent. I was very lucky that it came loose when I pulled the bike rack off the hitch😬. I can't return it because the time is up.