The black hex bolts/screws for the tank panels and pivot panels - all my black bolts/screws are a bit discoloured. Worn. I’d like to replace them so it’s either take ‘em off and give them a bit of a spray with matt black or buy new ones. So, before I go bezerk and buy a tin or matt black aerosol paint and end up with more paint on my kitchen than in the bolts, where can I buy these bolts/screws..? Does anyone sell something similar..?