Paul
I am new to the site and just started searching, I to have a 510 grinder. Hopefully you have found the mid size jaws by this time. I am looking for the small set of jaws (part number 4262) these are the round back jaws, not the flat back. I see you have a set of small jaws, if these are the same and you are willing, I would be interested in buying them. I had seen that you mentioned them in your first request for the mid sized jaws, I don't know if you are trying to put together the full set or no longer need the small jaws. please let me know if they are available.
thank you
Charles Kolbe