Depending on where you are located and what the laws are you might be best to try getting the place you purchased the unit from to find the spare part on your behalf. From the looks of it the only thing available is the machine new from a fairly reputable seller on Ebay. https://www.ebay.com/itm/New-Ultrex-Electric-Heavy-Duty-1-Quart-Ice-Cream-Maker-14009-In-Box-/293047821189
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Depending on where you are located and what the laws are you might be best to try getting the place you purchased the unit from to find the spare part on your behalf. From the looks of it the only thing available is the machine new from a fairly reputable seller on Ebay.
https://www.ebay.com/itm/New-Ultrex-Electric-Heavy-Duty-1-Quart-Ice-Cream-Maker-14009-In-Box-/293047821189