Just got a newer Nardi wood shift for my '92 C out of a '93 LE which is almost perfect. I can see that it was restored at some time but it looks great. I want to refinish the old one. I have it sanded down and was wondering how Nardi gets a knob and E-brake handle to look so yellow when the wood is walnut? I know that just putting on shellac or polyurethane would just darken the wood. Any suggestions before I mess this up?