A mate dropped his lovely 16gauge Durrs Egg double over a few days ago. One cone had collapsed and the other looked mighty suspect. I had a gentle go at them with a tiny pair of vice grips, the collapsed cone, there was only the square shank section left, actually just broke off at the top of the thread, the other one just felt too tight. I made up a mix of 50/50 acetone and ATF, soaked the breaches for a few days, applied heat with the War Offices little gas torch she uses for making delicious Lime Brûlées. Gently working the better cone with the tiny vice grips, a gentle rocking motion and lo, out it came. I removed the broken thread section with a small "easy out", I consider I was most fortunate as the vice grips could have rounded off the square section, but a ver careful approach. The thread appear to be in ver good condition and now I am measuring up the surviving cone which looks like a 1/4 with 28 TPI and Track of the Wolf looks promising, otherwise I will send it out to a chap I know in the US and have him make a couple of new ones.