Use steep wool, sandpaper, an abrasive pad or your heat gun to remove the paint and interior coating from a soda or beer can and then cut it into the appropriate shape with scissors so that it will jam in between the shaft and the hook. You can make it into a dome or arch shape so no bean(s) will stay unmoving on top of it. Properly shaped and jammed into place it should remain in place when pouring the beans out at the end of the roast.
An alternative if an alum can is not the right thickness would be to pay a visit to a local letterpress printer with your pan and ask them if you could acquire an appropriately sized brass (thicker) or copper (thinner) spacer. Be sure to clean up the spacer with some steel wool/sandpaper before using it!

Java "Prefers metal over plastic" phile


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