I have gotten myself into a fairly miserable situation. I bought a Frisco brass caboose, with the en-accurate ladder tops, only thing is, one of the roof walks is at least a scale foot off center. Thinking about removing the roof walks and ladders altogether. I have 250 watt soldering station but. What kind of soldering paste did they use? What do I need to get that would be compatable. Silver solder isn't working. Any help or advise is welcomed.