Richard is correct of course that you will see bubbles where the feed enters the section when pushing down the tube to fill. If your pen is not leaking at the section where the feed enters it you should be fine. If it does leak there, it is possible that in resetting the nib and feed you did not get the nib in the same location it was originally in. Many times the nib has created an indention where it has sat for so many years. If it was not put back in the exact same location it can leak. This can be easily remedied by removing the nib and feed and looking in the section to determine where the nib was originally positioned. If your section is hard rubber you can also heat it so that it reforms to its original shape. The latter should be done with great care as you can easily burn/melt the section with the amount of heat required to do this.
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