Hello. I've been told by contractors that I need to obtain fibre washers from the manufacturer specific to the gas hob I purchased that should have been included with the appliance. I can't see any indication online that fibre washers are unique to hob models. There's been poor communication and it's taken them 6 weeks to tell me they need this part so my trust is gone. I'm planning on contacting Beko about the washers but was hoping to get some advice. Thanks.