Some of the different types of front ends that have been tested. The front end mounted to the steel crankcase motor has a threaded nose to allow the use of low clearance bearings. The front end in the background was threaded into the crankcase for increased rigidity. Final assemblies are a .001 shrink fit in their crankcases. The two pieces in the lower right hand corner are sleeves which fit over the crankshaft between the inner races of both bearings. This set up allows the crankshaft & flywheel assembly to be mechanically fastened to the inner races of "both bearings" simultaneously.
