My son won his bracket in his GL 1303

[Wally]

Originally Posted by Steve C

Hi John

I want to dowel the flywheel to the crank and not just rely on the 5 bolts to hold it on.

Imo that doesn't do much if at all. Flywheel attachment relies solely on friction of the flat surface. Thats why the high torque of the bolt come in. If you reduce the surface (i.e. puts 5 dowels in there)...
If you break the friction, no dowel is gonna help you.
Anyways, I run without dowels, just the BAS 12.9 bolts and those are loose in the chinese chro-mo flywheel holes, go figure! Holds my junk so far ;-)

YMMV though.