I don't have a map for Grindstaff. Unless there is a map in T. Barr's book "Caves of Tennessee." I don't have my copy handy to check.
If there is a map, the TCS
(TN Cave Survey) would have it. Once you become a member of TCS, you get access all the maps and info they have. Well worth the little bit of effort required to join.
What is the current access status for Grindstaff? It keeps changing and most of the time it seems to be closed by a guy with an itchy shotgun trigger finger.