Ok, I've stripped it down, I removed the slow speed mechanism. I've pulled of the timer mechanism. (That probably won't go back on) I've pulled basically everything you can apart on this. The shutter is still cocked but nothing I do can get it to trip. What the hell should I be looking for next?! Almost all the references I've seen show the low speed as being the issue. I don't see what can be holding it back now!! This is driving me nuts! I'm ready to say that the FSU camera design is just crap and toss this one in the lake or sell it on ebay for parts.