it is the gear clust to the right I think that has the sprag on the backside. If you are just wanting to remove the gears and leave the hump, the inner primary must be removed to expose the cover on the backside. then you can just remove the gear clusters, reinstall, and find a plug to cover the starter hole. Little expense so long as you are not one of those that believe that the hump must go as God and The Queen intended....
- Mike