Raise the stem to the "minimum insertion mark" and try that. If that's no good, get a shorter stem.
Different angle quill stems aren't common: raising or lowering the stem achieves the same thing.
You could also look at more modern bars with a shallower drop.
If bar thickness, rather than vibration, is an issue, then slip an old inner tube on before taping (talc will help).
@Scilly.Suffolk started
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Raise the stem to the "minimum insertion mark" and try that. If that's no good, get a shorter stem.
Different angle quill stems aren't common: raising or lowering the stem achieves the same thing.
You could also look at more modern bars with a shallower drop.
If bar thickness, rather than vibration, is an issue, then slip an old inner tube on before taping (talc will help).