Flux (NC559TF) in syringe
Needle rests on soft pad to protect flux from evaporation. I added second thick pad to last holder planning to cut it to much thinner layer, but I liked additional weight so leaved it as is.
Syringe settles down reliably after being dropped from that position.
Serious engineering behind ;)
... and tools
Edit: adjust images by adding parameters height and width to [img_]