Fellow Malaysian here
I USED to be like you when I first started collecting fountain pens back in 2006 - a stickler for detail and perfection, I used to disassemble my pens whenever it goes out of rotation, for cleaning purposes. Each and every time. For EVERY one of them, regardless of rarity, price or age.
And the fact that I love to tinker with stuff and take things apart certainly does not help in this respect. But that's how I self-taught myself how to build and repair PCs and laptops, and relatively recently, cellphones* and tablets. And oh...my poor cars too
But there's a negative side to this "itchy fingers" behaviour - sometimes things DON'T turn out as you hoped and planned for. Going in blind a.k.a. trial-and-error, or with partial knowledge at times ends disastrously. A little knowledge is a dangerous thing, some people say...
Now let's see...how about that Nakaya feed that I snapped in two during an attempt to disassemble it for cleaning, and later found out that Nakaya DOES NOT sell parts of their pens...or the vintage Ancora piston that I busted while trying to take apart for, well, cleaning...or the attempt to glue together the cracked nib/feed housing (cracked it while trying to remove said housing for...you guessed it right again - cleaning) ended up with said housing permanently glued to the section and yet STILL LEAKING, on my Stipula Pinocchio - and the fact that the pen's section is in red resin means the resulting ink stain is clearly visible, and non-cleanable . And as if to compound matters, and press the point that stubborn me never learnt my lesson, 2 years ago I broke my ST Dupont Fidelio's feed** while attempting to remove it for...yup, cleaning! . Talk about fools and how they repeat their mistakes...
This is not counting the numerous misaligned (or even bent) nibs that I had caused as a result of my obsession with taking pens apart for cleaning purposes. Luckily by now I had become quite adept at doing simple nib adjustments and repairs myself (with the help of my beloved-but-battered Belomo 10X loupe and Richard Binder's nib-smoothing kit, and thank you very much for the knowledge and tips obtained from the numerous pen gurus here at FPN ), failing which I would just them off to Manjit at KS Gill's in Jalan TAR KL for more expert work.
The point here is (pun fully intended )... it is NOT necessary to take pens apart for cleaning, unless the nib or feed had gunked up and requires a more comprehensive cleaning (for which, I'll let the experts do if it's beyond my capabilities and available equipment). Rare is the pen that is 100% leak-proof, not even "excellent supreme QC" Japanese ones. And don't sweat the small stuff where the nib-is-misaligned-when-removed-from-its-housing-but-perfectly-aligns-when-fitted-back-in, and vice-versa - what really matters is whether or not the nib is aligned WHEN it's fully-assembled and ready to write, and that it produces a smooth, consistent line with even ink flow when it finally gets into action. It's actually OK even if the feed is not perfectly centred on the nib if it writes well. Just remember that some pens, especially Italian ones, are mostly handmade so please allow some leeway for a bit of human imperfection as long as it's tolerable, and the end product functional as intended. I can't remember the exact words, but the late Franco Grisola, founder of Filcao pens once said, it's the imperfections of handmade pens that adds value (or something to that effect) to them
So enjoy your pens in good health. Life is too short and stressful to get all frazzled up by some minor issues regarding a little spot of ink in a pen that uses liquid ones
*I'm certainly obstinate, and probably foolish too - as if I've never learned any lessons from my past misadventures, I recently took apart an iPhone 5c out of curiosity and ended up damaging said phone, and it's now in the trash can . Should've known better than to do that on a phone with near-microscopic screws, when I'm already losing my near vision and yet refuse to fit those ugly bifocal lenses on my spectacles.
**That freakin' Dupont's replacement feed is expensive. I had to "modify" a spare feed I found somewhere in my drawer to fit in, but it still looks weird in the pen although perfectly functional