Never heard of driveshaft problems, with 1.6 K series models only T series.
Clutching at straws. Wonder if the drive shafts are different part numbers from the 400 and 200 series? Know there were changes like clutch system that were different.
I’ll try and have a look on Rimmer Bros after to compare part numbers. What year was your donor?
I know 420 related but driveshaft length problems
http://www.madabout-kitcars.com/foru...ght=Driveshaft