Imagine if you will, you are clumsy and messy and careless and you are gluing tubes into blanks. They are loose. You pipete thin ca into the cavity between the tub and blank till it runs out the other end. You spray it with accelerator and it foams. You do that several times till the void around the tube is completely filled. Now, how do you get all the extra glue you got in the tube because you were to lazy to plug it with a potato or something. Can i brush the inside of the tube with a qtip with acetone or is there some kind of wire bottle brush that would fit in most tubes. righ now i use an exacto knife and files and it takes a while.