Already try them in resin 3D printed in 50mm width shell it’s works pretty well, perhaps few turns facing in the end of the thread in the brake side because I make them in 46 diameter thread, luckily you mention to refer PF30 standard. Then 46,5mm should be works isn’t ? or must be in 47mm?
Will be 56% silver brazed with Columbus life/spirit steel tubes, also this be my first time experimenting this. That’s why I make this thread (It is possible to braze stainless 316L with alloy steel?)—finger cross hopefully everything run with small error as possible 
Any additional advice about this? Thanks a lot Daniel