It is interesting that RS Components (being a huge UK electronics components supplier) has spelt 'potentiometer' incorrectly.
They have spelt it 'potenetiometer'
https://uk.rs-online.com/web/c/?sra=oss&r=t&searchTerm=potenetiometer+knobs
They have spelt it 'potenetiometer'
https://uk.rs-online.com/web/c/?sra=oss&r=t&searchTerm=potenetiometer+knobs