Probably not the correct way, but I just use thread that fits the smallest blocks in the build. I don't think there is a block with as small as 0.15 mm hole but I don't know this for a fact.
At this size the wound rope appearance would not be evident anyway, so a good thing. I do try to match the right size rope to a reasonable extent as the sizes for each line is easy to calculate for any given size and era of English warships from the 17th century onwards.
Me too, but when things get really small, I throw in the towel because I have a hard time working with that. I don't think I have ever worked with that fine a thread as 0.1 mm
Er... Well, there's differing views on this subject. Bees' wax has some issues with archival quality and acidity. Waxes are like "fly paper" to dust. A case will of course limit this somewhat, but it's impossible to avoid all dust. Fortunately, most of the synthetic cordage these days doesn't have the "fuzz" the organics do. For sealing and shaping catenaries and coils, etc., thinned clear shellac renders was unnecessary.
