These scales have a very large weighing platform susceptible any air flow. Here is how to make a small one for about $40 including shipping. You can order the stainless pan and pan support from A&D through OldWillKnottScales. To save your original, order another pan support. Then order a small stainless pan for the A&D HT-120 which is 2.75" diameter instead of the stock 5.1" diameter. The pan support is chromed plastic and easy to cut. I used a Dremmel with a cut-off disk and a drum sander. Sand the outside to just fit in the pan. With just the 2 pieces, it's too light for the scale to work. I added lead weights (#00-buckshot pellets) and flattened them a little to fit and glued them in with clear epoxy glue. With the added weight, it works fine.
This is the cut down pan support with the #00 pellets glued in.
This is the original pan & support.
The original parts weighed 97.053 grams. The new one with the weight added is 81.167 grams, but only 24.596 grams without the weights. The scale weighs everything the same. Besides the new support (exact same part number) was 6.444 grams heavier. I haven't got to work with it yet to see how it behaves.

This is the cut down pan support with the #00 pellets glued in.

This is the original pan & support.

The original parts weighed 97.053 grams. The new one with the weight added is 81.167 grams, but only 24.596 grams without the weights. The scale weighs everything the same. Besides the new support (exact same part number) was 6.444 grams heavier. I haven't got to work with it yet to see how it behaves.