Update!
I'm very pleased with the performance of my lightened 7M crank :)
We pulled 2.7kgs/5.9lbs out of it and coupled with the ATI Damper and JE pistons it's made a HUGE difference to engine response and off boost performance.
I ended up pulling the motor to remove the broken off stub using a special tool for the job.....
While it was out I decided to "Tidy it up a little" that was many years and many many $$.$$$ ago ;)
SB: The rear section is bonded inside the next tube and can slip inside making the Uni joints out of phase, if you look at it the Uni Joints should all be perfectly in line along the shaft.
If they're out of phase you can skip the clamp test.
SB: Grab a big hose clamp that will fit around the shaft and place it down near the rear Uni, Tighten it and make the shaft with a Sharpie where the Screw part is and take it for a drive.
See if it makes a difference then move the screw part and repeat, My "guess" would be it's a phasing...
I always give it a few whacks to makes sure the springs have let go before moving it away as well as wearing safety glasses whenever I'm in the shop.
(Had a 12mm Carbide cutter explode in the CNC today and I still can't account for 1/3 of it so I'm a bit paranoid about eye safety)
Dub:
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