I'd like some help on what to do with my hood pins since they have some pits that need ground down or polished? The pits are only nearest the knobs. What metal are the pins made of,who is a good,reliable metal shop to send them to,and what is the approximate cost to have them looking new again? Also,what metal are the round plates underneath the pins made of and do they go to the same shop as the pins would for resto?...thanks!