I've acquired 2 more accessories for my Grizzly 14 x 40 Gunsmith lathe and mill/drill. I purchased a Themac Tool Post Grinder off EBay, The price was right so I got it, the other is a Cen-Tech 6" Rotery Table that a friend gave me. I know the tool post grinder is of some quality having checked out the price of a new unit and the rotary table is not so much, being sold by Harbor Freight. My question is, are either of these items worth the trouble to learn how to use them.