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https://en.wikipedia.org/wiki/British_Standard_Whitworth https://jrcengineering.com/technical-support/whitworth-and-other-british-threads/ I can't find anything on Wentworth threads. Most Brittish MC (and Swedish) used Whitworth up to early 60's. I wrenced a bit on old Nortons a long time ago...

If it is Withworth (BSW) you mean it was very common here. In fact Husqvarna used it on most products up to they started chainsaw manufacturing. They used BSW threads on first saw they series produced, MS90. After the first Model/version of ms90's production was out they dropped BSW completely...

No, Stihl did not invent .063/1,6mm guage. It is a remnant of old days when 1,6mm .404 chain was tiny compared to others and all had it. At one point it was hardly sold by Stihl here as most used 1,5 or 1,3 but catching on again some some reason. They do have 1,3mm, 1,5mm and 1,6mm but are told...

I buy mine in grocery store. It does smell like french fries when its hot. About half price of the cheapest worst bar oil I can find and it works great. Oiler om max and just run as I stole it! When you run a saw you have a mist around you of fine oil and this you inhale if you like it or not...

I run it more than 10 years on all saws I run and all customer saws I get in here. Most customers run it now too. I have yet to see it gum up, get hard ot act up in a way I don't like. Put oil pumps up on max and let the oil take the heat with it as it fly off.

An Lightweight 16" is lighter than an Lightweight 20". Why carry more than needed?

Yea, right. 20"... That won't help much..

If you can run twice as long bars as needed, weight must not be an issue. There is a small difference when comparing bars of same length between the brands and models. A lot of difference in weight in length of bar. If you have a 24" bar on a 261, weight of bar is not the larger problem.