Roy99664
Member
I have noticed that the majority of people order extra tubes whenever there is a group buy. What do you use the extra tubes for? I am a newbie compared to most, but I don't think I've ever ruined a tube. Do you use them for casting blanks or what? I do have extra 7mm tubes for playing around with ideas, but I don't think I've ever actually needed one to salvage a botched pen. Just curious.