Platter has to be carefully lifted off, gentle prying, with 2 blunt metal tools or screwdrivers. One smooth swift twisting action of each driver to evenly lift on both sides and avoid cracking etc,.
Thank you so much sir for the help and advice. My first step now is replace the 5 pots because i think i have worn them ouy due to multiple turns. They are all loose now and can even be turned by just blowing on them.