I recently purchased a 1978 SG Custom all original but a little bit neglected. I had to replace the jack socket as it was proken, it also has a tone knob missing. I ordered a replacement but the numbers are nice and white but the others on the guitar are yellowed probably to years of smoke and sun. I don't want to replace all the parts but how can I get the new part to match the others better? Soak in Coffee or Tea? Any better ideas welcome. Thanks.