Good advice in reinforcing that engine former, those old IC ducted fan motors used to shake the hell out of everything. If something wasn't loctited with the red stuff, it would vibrate loose! Turbines are so much smoother. But ah the good old days of blown glow plugs, oily residue on everything and trying to turn after takeoff without stalling. Ha! Nope, still don't miss it! But I applaud you for doing it, we all know how colossal a pain in the butt it is to get those things to run just right. We are all a bit spoiled now.