Fender Stealth String Retainer Bass

I bought two of these retainers for a Squire CV70 guitar because the A string alway buzzed (typical for Fender Precision basses as the string has almost no slope between the head and the neck). Unfortunately I did not read carefully that these retainers are made for guitars with screwed machines and the CV70 has simply glued machines. AS the string tension is huge, the string simply lifted them up as well as the machines. So had to put them aside.
Later I replaced the CV70 with a Fender AM Performer and I could use the string retainers (as the are designed for such guitars, obviously). It was very easy to install them and the only disappointment (that is I marked 4 stars only) is because the material is weaker than I thought and the retainer hooks are a bit sloped by the strings. The whole thing works but looks a bit strange due to the weak material.
Finally they pull the E and A strings downward enough to have a positive effect but I am unsure if they worth the price, to be honest.