Originally Posted by base2

The scraping noise is internal somewhere. Most likely it's a planet scraping by the stamped sheetmetal housing. You can actually feel it with your hand as you rotate the crank arms & touch the housing with your other hand.

g_faq.internal.life.1 by Richard Mozzarella, on Flickr

It's the chainring, the trouserguard, indeed the whole rotating assembly that has become sloppy.

I witnessed the installation at the bike shop to see that it was professionally done with all the proper tools. Which were all readily available, organized & marked. The shop was an authorized installer/retailer for many years until Haberstock bought the brand.

As far as the bottom bracket bearings & spindle, that's all good. Zero slop, smooth as butter. Most likely it's the bearing/bushing at the center of the planet carrier that has worn & is allowing the rotating assembly to slop around.

At this point, I have pulled a spare replacement crankset out of the garage & have some Gevenalle Audax shifters on the way. The Schlumpf is getting replaced.