The cascabel was held against the tailstock center. I have a nice little Royal one,which has a slim point that comes out from inside the #2 MT. shank. Not real cheap,but great for small work. You can see the left over nub in the picture where the breech is just clearing the carriage. I'll machine it closer to a finished ball,then file the rest off carefully. I haven't gotten rid of the nub yet,as I still want to put the barrel back in the lathe to polish it with fine abrasives. I'll turn a brass stub with a wee bit of taper to it and put it into the muzzle and hold it with a collet. The power required to polish the barrel is very low,so the lathe will turn the barrel quite well.