I am building an Early Lancaster flintlock with a 42" swamped barrel. For the life of me I can't remove the breech plug. Every attempt causes the barrel to slip out of the vise. I have used leather to cushion the barrel from the vice jaws and then wood but the barrel still slips. I have a pattern makers vice and I tried it in that because the jaws will align with the flats on the barrel. (makes me want to take up a new vice ). The barrel is a Colerain .45 caliber with a B profile. Any hints out there? I' sure I am not the only one who has had this issue.