Thanks for your help, I will have to take a look tonight, but I'm thinking the new engines we have are very similar to the Pilot shaft one.
It looks the same as the HPI ones, just not as long, as the HPI one uses an extender that screws onto the threaded end of the crank, that actually helps keep the flywheel in place as well as holding the springs for the Clutch.
Here is the link - hpiracing.com/graphics/instr/a910p1.jpg
I'll definately take some pix tonight.
My biggest concern will be no being able to use these engines..