Spindle DRO not changing

[Matty Zee]

I'm trying to write my plugin to display the actual spindle speed on the DRO. If try and set DRO 39 ("True Spindle DRO") nothing changes, its always 0. Yet i know my code is ok as if i use DRO 817 ("Spindle requested DRO") then the GUI updates (but not where i want it shown). Is there something else updating the DRO that is overriding my update?

Thanks

[Matty Zee]

Or should i not be updating the DRO directly but rather Axis 7 struct (which i understand is the spindle...)?