TWSBI pens are very popular among fountain pen users. They are well built with good quality materials used and importantly they are affordable to most people. Additionally, filling systems used and ink capacity are great too. They are also easy to maintain, but many users are afraid of taking them to parts or not sure how to do it. Vac series with unique filling system seems to be especially difficult to maintain and finicky. The simple fact that along with the pen TWSBI provides a ‘special’ wrench and silicon grease can discourage many. The truth is, that taking TWSBI Vac to pieces and putting back all parts is actually very simple process. Because I have just finished bottle of Iroshizuku Kon-Peki ink which I used with my TWISBI Vac mini (review), I decided to try a different ink, which turned to be a Sailor Jentle Souten (review soon). When you changing ink in your beloved (or not) fountain pen is highly recommended to clean up and flash through your pen. Otherwise the remaining ink residues (mainly in the feeding system) can react with the new ink, which next may lead to creep forming, which may resulting in the clogged pen. I took the opportunity and I did some pictures of the disassembly process when I was cleaning my pen.
Disassembly/assembly procedure are exactly the same for VAC 700 and Vac Mini.
What you need? Not much, really. TWSBI tool, paper towels, a swab and eventually small bit of silicon grease usually provided with the pen (look carefully for these in the box).