96 civic HX K24a
Sounds like things are progressing nicely !Thanks @Lotus for your experience on the driveshaft side. We will work out a solution like I proposed above with conventional machine elements. Of course we use approaches to reduce the notched impact effect.
This Saturday we will mount driveshaft and exhaust back, connect the harness and plug the ECU, fill up all liquides and run the engine to see how far we are from dyno ready. I've talked to an owner of a roller dyno about possible time slots to tune the DAMPFHAMMER.