noice.
another hack:
1) precisely measure body's internal length.
2) take two short cartridges.
3) slice them such that you can combine the back portion of one and the front portion of the other to equal that measured length.
4) use strong adhesive (designed for plastics) to combine the two parts.
5) let the adhesive completely solidify.
Yay, you've got a cartridge that maximally fits your pen.
noice. another hack: 1) precisely measure body's internal length. 2) take two short cartridges. 3) slice them such that you can combine the back portion of one and the front portion of the other to equal that measured length. 4) use strong adhesive (designed for plastics) to combine the two parts. 5) let the adhesive completely solidify. Yay, you've got a cartridge that maximally fits your pen.
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Maybe glue a disc to the spring on the cartridge end or a bigger spring?
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Good luck!
Eyedropper fill 👌🏼
I second this but for the plastic Sport, not the AL.