It was hard to be sure about the length as no flashlight could reach deep enough to see and all my pick tools weren't long enough, the only thing that gave me a general idea was a telescoping magnet tool and from where I cut (about a cm from where the shock mount triangle metal meets the tube) there was still about 6inches inside... Plus the the stuff on the other side of the cut which seemed to go all the way to the pinch!
What I ended up doing is yesterday I put some wd40 wherever I could squeeze it in the tube and then today I just got a socket that was just smaller than the inside diameter of the frame tube and hammered that sob back enough to where my slug will sit equally on each side of the joint. So for future F2 frame choppers, if you can't pull it out, you gotta just drive it in!! Words to live by!
