Thanks Norm,

I dragged out one of my old engines. Yes it looks like everything lines up. Yes it is that type that sticks up through the cowl. I guess the lower part just comes off via a thread just turn the the whole thing against a locked flywheel and it undos like a nut. Left or right handed thread? I hope the flywheel magnets etc are the same. I have never taken off a Briggs flywheel before, Obviously a puller is needed. I like to keep well away from Briggs..

All the best
Jeff