On my last couple of builds, I have remembered my youth, and gone back to silver-soldering wherever possible, instead of the more usual soft soldering. The easy availability of silver-solder pastes (in syringes) and small torches makes this so much easier and more viable. To be frank, I find it very much easier to get a clean, good job this way than I do witth sft soldering now. The silver solder pastes tend to hold the job in position during heating, and, if used sensibly, deposite very little extra solder on the job - which spreads in a very thin layer, and usually requires no cleaning off. I have a jar of 'pickle' and an ultrasonic cleaner, and thats about it. At the moment, I'm two-thirds of the way through an 0-14 Kerr Stuart Wrenn - which makes for a very small loco, and only the boiler barrel is soft soldered. Even the backhead and all its fittings are silver-soldered. The industrial Garratt I built recently had all its valve gear Silver-soldered. it is a surprisingly easy process, and can be very delicate indeed. From our point of view it also enables the further soldering of items ( both silver soldered and then soft soldered) without the whole thing falling apart.