I'm really impressed with the Venhills cables in Featherlight spec. I had a very stiff clutch on my Commando which required 27 pounds of pull measured with a spring gauge. This was with a freshly oiled conventional cable. Just by switching to the Featherlight cable pull was reduced to 15 pounds. Changing the stack height cut the pull even futher, it is now down around 7 pounds, but the cable change was the biggest factor. Stainless cable on teflon is very slippery and, unlike nylon, which has been used as a liner in the past, teflon is not hygroscopic.
One other member used my sketch to order cables from Venhills and they came out fine. He sent Venhills a copy of my sketch as they did not have it on file. He was using the same Thomaselli throttle so everything worked. If a different throttle is used, the free length needed might be different than on the sketch.
Glen