I am not able to find just needles for solder dispensing tubes which uses a plunger with a needle, therefore, it is imperative to clean the one which came with the tube. Does anyone know how to get all of the solder out of the housing and needle so it can be used again in the future?
Are you talking about flux or solder paste?
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You might/can use some thin and springy steel wire STRANDS taken from a bicycle break cable or similar or some very thin diameter drilling bits etc and once you’ve managed to protrude thru it use an empty syringe body (that has a plunge) and fill it with either RMA 218 flux paste or the 800 (the non clean variant of it) and attach the needle in question and start pushing the plunger harder and faster (again and again) so the squirted RMA flux comes out clean. The same RMA flux can be used to literally revive the old solder paste even years after it seems to have been set and has a dry and crusty look. There are some videos showing you such things on YouTube :
https://www.youtube.com/watch?v=A_y3Rx9Wllw
I have bought some from a well known Chinese site but this can take awhile to arrive
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