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You can eyeball approximate the above positioning by yourself by holding the reg upside down with the hoses hanging (gravity substituting for buoyancy) with the can and mouthpiece in the correct positions relative to each other. The thing is to ensure that both hoses are adjusted so that neither is putting any torque on the mouthpiece (evidenced by them not hanging freely or equally).To be truely vintage use a sundial for the hose orientation. Alternately, hang the SCUBA on your back, grip the mouthpiece, look straight ahead and have a second party manipulate the hoses at the regulator until the mouthpiece is comfortable. Request that person lift each hose as to simulate buoyancy. Apply marks on the hose ends and the regulator. Later, use the marks to clamp the hoses. Take notes, the hoses are mounted at different distances from the regulator face due to the design. This means that the left and right hoses may have slightly different orientations to feel right.
When figuring weighting of the belt, bear in mind that each hose has about 1 lb buoyancy. This may eliminate the need for ankle weights, if they are normally used.
OK
What I want to do is change the thumb screw yoke on my working double hose with the one in the second image, I hoping that's all I'll have to be to make my double hose work safely with my 3000 psi tanks. Or do I even have to do this? Would the thumb screw yoke work with my AL 80's?
So would this work? and how would I remove the yoke?
Once again thanks to everybody for the advice and support
Dave