moparcolt ,
If you're interested, I'm having a machine shop make up timing adapters for short shaft engines (5/16 shaft) only. These will have a 1.375" finished diameter, and will be a direct replacement for a flywheel. They will come with a 1/8" diameter rare earth magnet installed and will have an internal taper to match the crankshaft taper. It will be retained by the prop adapter you already have and rotation will be prevented from any rotation after installation by installing with red Stud and Bearing Mount Loctite or JB Weld applied to the taper when tightening the prop adapter. These timing adapters will sell for $21.90 including shipping and should be available in about three weeks. Complete instructions will accompany each adapter.

I needed about 6, so I took a chance and am having more made.

Let me know if you are interested.