Thanks! A black conversion headset would look good with this frameset, but the Tange Falcon headset is original and in great shape, locknut included (though its height is quite something).

To clarify on the beer can shim: There is a 1" quill stem adapter with fine splines. A spacer/shim (with a full length slit) slots over the adapter. The 1 1/8" stem slides over the spacer/shim and clamps down as normal. All of it is super straight forward, however, the spacer/shim+adapter diameter ended up being a touch too small for this stem's clamp. The stem could have been made "too big" with regard to tolerances, but whatever, there I was needing a solution. Just needed a touch more diameter. I cut up a section of a 12 oz. can of Bale Breaker's Bottom Cutter Imperial IPA (pour it into a glass to properly taste it, if you ever get the chance ) and used it to shim the adapter. It added not even a gram of weight while solving the problem. I am a happy camper.

For fun, the Modolo quill stem weighed a whopping 359g. No wonder I could knock 160g total out of the "old" stem/bar combo.