We have a DMG DMU 80 with a Hoffman 4th axis. We are getting a A74 axis encoder input alarm. We are thinking that the rotary scale on the Hoffman indexer is bad. If it is we are looking at having to change the Heidinhine rotory scale in the back end of the unit. Anybody have any input on what will be involved in this? Any tips, tricks or hints would be GREATLY appreciated.