Re: getting the trigger off 50 hp mercury
What you have left is the flywheel hub. (you DID mark the flywheel for proper realignment before you separated it from it's hub - RIGHT?)
You were supposed to pull the entire flywheel assembly with the correct puller - it threads down into the center of the flywheel hub. Most dealers will pull it for a nominal fee. Or buy the correct puller - they are on tight.
-W