does anybody sell this?
Just Googled it and got a bunch of hits!
Make it idiot-proof and along comes a better idiot
You can get liner to the .187 flex shaft, but it is not going to fit inside the stock stuffing tube.
You can run without the liner, or you can modify the stuffing tube to the next size up and run a liner.
There are a couple good posts here on what is needed and how to do the stuffing tube mod.