I have found Cool Heat paste very effective on small assemblies.

MichaelG.

I assume you have initially used a low temperature silver solder eg 42% with cadmium or 55% cadmium free.

The remelt temperature of both is higher than their original temperature. This is caused by the solder absorbing copper and changing its' composition.

Do a simple test.

Replicate 4 stays in a line. Braze them. Let them cool.

Now set up a parallel line of stays 1/2 inch apart.

Braze them with your low melting point silver solder. Use a suitable burner that will enable you to control the heat. Watching the flux will help you to avoid overheating. As soon as it goes clear your are at brazing temperature. Ensure you also cover the first line of joints with flux to protect them if you do remelt them

Alternatively attach a heat sink where rfequired. This could be a damp rag, a mole grip wrench or apply Pyrocool – a spray product available from Advanced Engineering Ltd Redhill (no connection other than we used to sell it – demand not meeting expectations).

Keith