I have done a caster in TurboCad pro17 it is nothing fancy nor what the machine can really do. I am just getting used to it and needed what I could not find without registering for something. I hope Turbocad as others have done opens up to symbols. Perhaps rough drawings yet enough for putting together that Frankenstien of an idea, can become a better mark. I am disabled and don't have a lot of extra cash...I don't mind being called a bit socialist...but it has to go around. Heck I know perpetual I did it yet got beat down. Yet I needed a caster and couldn't find one without pain. So here is a rough burn your own hole pattern, just shove it in there and see how it looks stitched so. Bolt and Nut not spec just raw and such but for Franky ways and fair. See Download again it is Pro 17 may not be so well for others. Regular A regular TCW drawing. Enjoy...boy my 17 don't like dealing with my 15; what pains.