Dont use the stock tailwheel, get a leafspring tailwheel for it. I got one for a 15 to 18 lb plane.
Epoxy the triangle piece on, it won't come off. I cut a groove in that piece, and have the tailwheel spring holder bracket epoyied to it. It aint come off yet, and I doubt seriously that it even will. I'll post a pic in a minute, I need to take one for you.