You can still purchase this! See here→ http://amzn.to/2gYjvuY
This is the type of lathe it best fits→ http://amzn.to/2h0Izht
I thought it was not available anymore but I was wrong. This isn’t fine German engineering or anything, but it does work and has held up after several uses. But it really is made to mount to the Harbor Freight Lathe. To use it on another lathe you would need to jerry-rig some kind of setup.