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I used a set of Hawkins long range hybrids in 34mm and had them machined out to 35mm by a fella in the states for my razor ti and mk5hd 3.6-18. Fits perfect
Hawkins makes rings in 35 if you can find them. That's what I've got for my mark 5HD. I don't know about the lightest, but they're certainly not heavy. Not a lot of options in 35...