I had the same thing happen; of my four vials, the green has completely evaporated and the red, blue, and orange are on their way.
My solution was to buy some 5ml glass vials with removable leak-resistant caps, along with 12mm diameter magnets. The plan is to affix a magnet to the top of each cap and another to the inside of the hypo. This should keep the vials firmly in place when inserted while allowing me to refill the liquid as needed down the road.
I would have chosen magnets with a larger diameter, but there’s a slight curvature on the edges of the caps, and I wanted to avoid any gaps between the caps and magnets. When inserted, the combined height of the vial and the two magnets (one on the cap, one in the hypo) will come out to just 1mm taller than the original vial.
I’m also thinking of painting the caps silver or chrome to match the magnets, which will hopefully make the entire top look more uniform. I also like that the countersunk magnets give the appearance of an opening to the vial.
I’m not sure what the forum rules are regarding posting links to commercial websites, but you can find both the vials and magnets easily on Amazon. Simply search for “
JIUWU 14pcs 5ml Mini Clear Glass Bottle Vials and Plastic Cap Small Essential Oil” and “20 Pieces D12mm x H3mm,4mm Hole, countersunk disc Small Multi-Function Refrigerator Magnet Refrigerator, Science, Crafts, Engineering Science, Educational Magnetic kit (12x3x4mm).”
I’m also thinking of buying smaller magnets to place inside the caps in order to keep the 12mm ones in place, and thus avoid having to glue them. I would have used my existing ones, but the 12mm diameter is too big to fit inside the neck of the vials.