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More than once I have tried to mount a 40mm Dellorto on the H cylinder of an F1 and a TT frame, only to have it in serous conflict with the frame and/or the engine. I have twice sliced and spun the thing and then welded it at the correct angle - that is the one on the left. The new one in the middle does not work either - I don’t have the part number.
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But the one on the right, with the numbers shown, fits fine. Notice how the notch for the mounting stud and nut seems to be “off”, like the problem got noticed, and sorta corrected - this spins the spigot inward and upward away from the frame and engine. Not a problem for a Pantah frame, just the frames with the tubes meeting in a triangle above the cam. MikeV
And I just remembered that Carlo now sells his version of these. I am sure he has solved this problem.