Pot metal is very difficult and in most cases expensive to restore. There are a few people who know how to do it and many who do not. Not all pot metal can be restored and some pot metal that can be restored can't be brought back to 100%. Find someone who will drill out the pits and fill them with silver solder before plating. Many companies will try to grind out the pits and this is how you lose all of the detail, round off the edges and get trim back that is all wavey. One's own expectations may not be realistic when it comes to pot metal restoration. It is not like restoring bumpers or chrome steel, it is very labor intensive and if a part is a 1 ot 2 on the 10 scale it probably will never make it past a 6 after restoration. Start with the best pieces you can and if your trim is really bad and you can't fine better pieces then you have to be realistic about the outcome.