Lyman still makes & sells the tong tools, dies and parts. You might check with them about new parts. The one issue with the tong tool is that it really doesn't full length resize the brass. Long term, making sure your kids have presses and dies would be a good thing.

BTW, I seated bunches of wadcutters & SWCs with whatever (RN) seating stem came with my 310 dies.

Dunno about Coke, but there are commercial rust removal/neutralizing chemicals. Naval Jelly is one consumer grade product. A non consumer grade product is Meuratic (sp) Acid.