One issue I do have with these drives is noise, when they are running you dont need a sound module
Following on from what Catengineman was saying I think the Graupner realised their mistake with the plastic Bevels and fitted brass ones. I have just recently stripped and serviced mine and my gearing is definately metal.
Just on the point of lube, just at the point where Umi has put her green/red support plate there is a grease nipple, always pump a bit of grease into this, I use a small syringe (minus the needle), kindly donated by my Nurse Practicionator for this purpose.