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hi i am dan i can help you with this. most likely the plastic keyway on the back of the knob is cracked or striped. you should be able to easily just replace the knobs. this is a good site for parts like that
but you will need the correct model number for the unit. if this answers your question or if you have any more questions about it please let me know and if you could rate me on my service by selecting one of the 5 stars at the top of your page i would appreciate it. thank you for using just answer.
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