Hi HMEM, First of all thanks for this great platform - a huge source of knowledge and inspiration to me. After sneaking around for a long time I thought I might also share something. Recently I needed a small 3-way fitting for my hydraulic line. I decided to braze one using some small (OD=4mm) hose nipples from Swagelok. This small assembly posted an obvious problem how to hold the pieces together during the brazing process so that they don't move. The idea here is to show you the little jig I used to hold everything together that worked quite well. In my experience proper brazing jig needs to meet three requirements: 1) It has to have low heat conductance not to take much heat from the workpiece and hence keep the brazing time as short as possible. 2) It has to be stable enough so that the parts don't move on you while brazing. 3) It can't introduce too much pressure, otherwise the parts will deform during the heating process. These conditions are somewhat contradictory so it takes some time to design a proper fixture. And of course the build of such fixture usually takes much longer that the parts in question or the brazing process itself... Following photos show the individual parts, assembly held in fixture, brazed assembly and finally cleaned up finished 3-way fitting.