Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I should have believed other reviews regarding product quality !

I have a BS in Industrial Engineering & consider myself much more than an amateur handyman. i thought I wouldn't crack the plastic knob when inserting the screw!! Well guess what, these are cheap plastic & have no metal threaded insert like my vintage Club Aluminum cookware set. So both these "Fitz All" knobs ended up in the trash. Amazon why do you continue to stock these inferior replacement knobs?? I would gladly pay more to get something that is high quality for those of us that like to keep our things at least like they came new or better!