FWIW, I did the same thing and used epoxy on my own mower.

Thanks for the reply. I guess it's still holding up. The switch still kills the motor but it coasts down to a stop instead of braking. It wouldn't bother me a while back but I want it right because my son is now starting to mow (and stealing all my fun!)

Is this the mower that was vibrating?

Yes to Saxman's question. Thanks

So what was wrong with it?

It would not start. I pulled the flywheel to check the key and check the run/kill switch at the end of the wire from the cd pack. The key was very slightly curved (maybe from me using a rubber mallet on the ratchet handle to break the flywheel nut free) and the zone start cable would not pull on the switch enough to break connection. I bent the switch's wire lead to adjust it to break contact sooner and put it back together with the same key. The switch must have been the culprit because it started. I used the same key out of curiosity (I will change it when I pick one up to see the difference). I may be too sensitive to the vibration. It shakes most when the front wheels are off the ground and calms down when all four are on the ground - I know thaat seems obvious but it may mean the frame is not as sturdy as some I've used. I have had some mowers that would turn (compass) direction by themselves on level concrete they shook so much. This isn't nearly that bad, but would probably numb the hands after mowing about 20-30 min.s . I'm going to look at the blade more closely due to
someone's reply earlier. The mulching decks these days seem to be deeper and so some crankshaft PTOs are longer and I think they're much more subject to bending (especially at 7/8"). I did notice some pull back when restarting the mower at operating temp if I didn't pull through hard for more momentum (so it may be more dependent on slight changes in timing than I thought). Pull back is the cyclinder firing BTDC and reversing the engine, correct? I've had violent pullback before - thanks to this forum, I won't try to start one without ablade or with a loose blade any more! It starts on the first or second pull though so it's close. I want to get this one right and learn something in the process - I have a sweet self propelled deck that will accept this engine and be my main mower. Thanks.

My Tecumseh seems to vibrate a little more than some other 4-cycles I've had, but everything is optimal, so it has to be the internal balancing. It's not bad, just noticable. That was me telling you to check the blade. I would get a new one - it helped mine.