Ruger - we use a pretty sturdy industrial solder to put the original wire on - so people don't have to change them. If they did and added even more solder - you will need a hot iron like that from hakko, lrp or trakpower to get then on. Someone at a track may be able to help your, or a local hobby ship. Worse case scenario - you ca always send it to use to re-attach wires for you.