This replacement yoke slider is 3D printed from ABS.  The package contains two sliders as these are a wear item and may wear out quicker depending on how well lubricated.

Here is a link to a YouTube video showing how easy it is to replace it on the Shopsmith model 610:

YouTube Replacement tutorial

The nameplate indicates SAE10 oil should be used.  The nameplate has to be removed to access the fill plug.

Another 3D printed option uses nylon material, the design is available thru shapeways.com.  It looks more like the original design except I thickened the walls.  If you are interested, a search on that website should find it.