Two shadows is right. I think one problem with silver solders is that the type twoshadows refers to, should be called silver bearing solder rather than silver solder. The silver bearing solder flows at less heat than does 50/50 lead solder and is much stronger and just as easy to work with. I use it regularly for common solder projects. Most people do not use enough flux and fail to get a good flow by uneven heat between the two parts to be joined. STAYBRITE silver solder flows at 430o if I remember right, also if I remember right, it, and those like it, only have 5% silver in them, but thats enough to give them greater strength. I would never use the drilled type tennons on a smooth bore!