Bottom or top, never mind, it is the extremity of the international cart that is not meant to be pierced - I think anyone could infer what I meant.
Nevertheless, if you read my post you'll see that what is written is top, not bottom.
" And to clarify, this trick will only work on Sheaffers because the tube is intentionally sharp ".
I know! Not only sharp, but also, made of metal, which is hard.
Nipples on other brands, have plastic nipples, which can break, when forced. When putting Parker Penman cartridges on soft nippled Parker pens, I use my Victorinox pocket knife to pierce the rather thick Penmman seal/hole, prior to insert the cart in the pen, otherwise it requires lots of pressure and risks possible damage to the soft plastic nipple.
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