got around to doing this today. I applied silicon around the top part in the little crevice that runs up there, filled that in. the screen still jumped but it was a lot more infrequent, maybe once every 15-20 minutes and that is pretty darn good considering it was jumping once every 15 seconds. I left it on for around 2 hours and it rarely jumped.
so I would say this is another success. I plan on leaving it on for a few hours and see if I can get it to jump more frequently so maybe I'll be able to see somewhere to apply more silicon, but I'm pretty happy with it how it is now. so thanks to all who suggested this quick fix. I plan on getting the flyback replaced some day, but at least I can play the game in the meantime.
It was a pretty good day for arcade repair. i have a war gods cabinet with an Xbox 360 in it and the speakers had a lot of static, I couldn't figure it out for a while. then i noticed that it seemed to just be the left one, so I went to unplug that one and low and behold I found this little piece of plastic stuck inside the speaker, sitting on top of the cone. I have no idea what it is but once I got it out the speakers sounded great.
I also had the x360 that was in that cab die on me though today. E74 error, which I've read can sometimes be fixed by taking the heatsinks off and applying some thermal paste, tried that to no avail so I junked it. replaced it with one of the other 6 xbox 360s I have around the house.