Had the same problem a few years ago after putting a Cinelli Grammo on my Sarto, played around with stem heights with poor OD of spacer to OD of stem match... have access to lathes so machined down some thick wall tube (or possibly solid bar?) to get it to fit. In the end I had aluminium headset / stainless spacer / Ti stem / stainless spacer / Ti headcap.. surprising the difference in colour of each material even after polishing.
Had the same problem a few years ago after putting a Cinelli Grammo on my Sarto, played around with stem heights with poor OD of spacer to OD of stem match... have access to lathes so machined down some thick wall tube (or possibly solid bar?) to get it to fit. In the end I had aluminium headset / stainless spacer / Ti stem / stainless spacer / Ti headcap.. surprising the difference in colour of each material even after polishing.
It worked nicely though
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