Get yourself an Ungar Handle for screw in elements and an Ungar 33 Iron clad Tip, Some thin guage silver solder, what I use is .055 Dia., You can find the Iron, 33 Element/tip, and the solder at commercial Electronics Web Sites. You will also need a good hot acid flux like the ones sold by welding supply houses, a wet spung made for cleaning your soldering iron tip, and a stand for your iron.
Before soldering use an emory board to clean up and score the areas to be soldered, then brush on your flux to these areas just before you put your iron to them, always heat the solder joint and then apply the solder to the joint after it is good and hot. Be careful not to get flux on your skin as it can cause a nasty acid burn, and be carefull with that Iron at over 1000 deg.s F it will melt right throuh fingers, etc,. You want a joint with just enough solder to cover it, and the solder when it hardens should be very shiney, if it isn't you have a cold joint the will break apart. After soldering clean the chassis first with baking soda and a little water to neutralize the acid, and then with warm water and dish detergent. Use this method and practice making good joints, like everything else you need practice to train yourself to solder properly.
CHEERS!
Tom