Humidor drawer divider issue

Although the normal foam strip you find on the end of dividers has many uses, its primary use is in the window industry. It’s used to seal the gaps between many surfaces. It’s not as thick as standard weather-stripping and can often be found in between a stationary window and a sliding window. It comes in various widths and thicknesses and is not generally available in hardware stores. The weather stripping you will find in most retail stores is much thicker. The problem of dividers being too big or too small is very common. I have been struggling with finding the exact size that is somewhere in between too small and too big for my trays. One batch they are fine when they are shipped, but are too big later or shrink and become too small. Lots of good suggestions so far, basically anything that will fill the gap will solve the problem.

Chas