Not all today, but finished it up this week...
A couple months ago on a late night drive home from work, a downshift on the off-ramp was accompanied by awful whirring grind. A half-mile push home and pulling the tranny revealed stripped splines on the clutch disk. I was so annoyed--I just had the tranny out 5k miles ago (bike at 22.5K miles) and the splines looked fine. I reassembled and relubed with Honda Moly 60--the splines were dry on disassembly.
A new clutch plate went in and on reassembly I used a cocktail of Moly and Wurth 3000 ($25 for a lifetime supply). Checking the drive shaft splines they did not look good (they received the same Moly lube 5K earlier). Since it is my daily driver I reluctantly put it together with my new Moly/Wurth cocktail while I developed a plan.
A new BMW drive shaft $450. Contacted Brunos and he wasn't taking any work "for a few months." Another site no longer taking the work...
...I was running out of options.
I found
Motobins.co.uk and ordered a replacement spline. About $95 delivered.

Then searched for a shop to weld/assemble it on my driveshaft. Not one local driveshaft or machine shops would touch it. I heard lots of excuses about liability and not the right equipment.
Finally I found a driveline shop in Winchester, VA about 75 miles away that agreed to take a look. I mailed it priority mail Thursday morning. Friday afternoon I get a call from John and its done. I settle the bill ($170) and two days later it arrives and looks good.
I just got it in the back in the bike last weekend. Four days of heavy rain ended last night and I took it to work today and it was smooth up to 70 MPH--as fast as I could go in rush hour traffic!
I'm happy. I'd still like to send a shaft/final drive off to Bruno for a full workup, but what I have now should be good for 30k.
Kontoboy