Sac Sizes For Waterman W3 And Conway Stewart 75

[adeleg]

Hi!

I just purchased a Waterman w3 and a Conway Stewart 75 on Ebay ; the bladders need to be changed, but I don't have the pens yet, and I want to order bladders now so that I might receive everything around the same time.

 

I looked for the dimensions online and did a search on this website, but I couldn't find for sure what size sac I should use. Some recommended sizes 16 or 18 for the w3, and one recommended the 18 for the CS 75. Is the sac size a bit flexible, do you think for example I could order sizes 17 for both pens?

[pen lady]

If you are getting into re-sacing pens, why don't you order a range of sacs in various sizes? A few 14s, and more 16,17 (if you can get them) and 18s. You'll use them.