Slide Guide Pin Moving On My Stock Mikuni 28mm's

[knight_ripper]

I was riding some dunes and all of a sudden, my left carb is stuck wide open. I just flew back to camp and killed the engine. When I took it apart, I initially thought the pin had broke off, cause it wasnt there. But then I simply pushed it back in. My slide is pushing it out of place. Basically you can move it without any problem. Im thinking some JB weld on the outside to keep it in there? But then again, I dont know how its sapposed to stay in there to begin with. The guide pin, when I take it out of the carb, has no threads on it. Is it just punched in there. I cant imagine that thing falling out on the dunes. In fact Im lucky it didnt happen to me out there at Sand Mountain, NV. Any ideas.....????? I need to go riding tomorrow....what to do?