Don, that is the first thing I used. I ran several very tight patches through that I had to use a block of wood on the floor and beating the rod through.
I just got done making new washers that are on both sided of the bearings in the handle.
Yes it took a lot of the lead in the beginning but what is in there now just won't budge. The patches come out black but not the lead.
All this cleaned the carbon out so it's a beginning