thermowell for corny?

Does anyone make a thermo well that will fit a corny keg dip tube hole? I searched but couldn't find anything. I think the brewers hardware thermo wells are a little too big to fit the corny. Figured I would check before I go about destroying a stock tube. I ferment in a ten gallon corny, so I'd like to find a nice shiny sanitary thermowell that can either fit through the dip tube hole, or fitted into the lid somehow. Thanks for any info!